Stop using 'using namespace'.

This CL removes all the instances of 'using namespace' from C++ code
(more info https://abseil.io/tips/153).

Bug: webrtc:9855
Change-Id: Ic940fe87c5047742cfa6d60857d2f97be380ed18
Reviewed-on: https://webrtc-review.googlesource.com/c/113948
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25985}

modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc

@@ -41,8 +41,6 @@
 #endif
 #endif
 
-using namespace std;
-
 int main(int argc, char* argv[]) {
   char inname[100], outname[100], bottleneck_file[100], vadfile[100];
   FILE *inp, *outp, *f_bn = NULL, *vadp = NULL, *bandwidthp;
@@ -425,27 +423,27 @@ int main(int argc, char* argv[]) {
   printf("Output file: %s\n\n", outname);
   if ((inp = fopen(inname, "rb")) == NULL) {
     printf("  Error iSAC Cannot read file %s.\n", inname);
-    cout << flush;
+    std::cout << std::flush;
     exit(1);
   }
 
   if ((outp = fopen(outname, "wb")) == NULL) {
     printf("  Error iSAC Cannot write file %s.\n", outname);
-    cout << flush;
+    std::cout << std::flush;
     getc(stdin);
     exit(1);
   }
   if (VADusage) {
     if ((vadp = fopen(vadfile, "rb")) == NULL) {
       printf("  Error iSAC Cannot read file %s.\n", vadfile);
-      cout << flush;
+      std::cout << std::flush;
       exit(1);
     }
   }
 
   if ((bandwidthp = fopen("bwe.pcm", "wb")) == NULL) {
     printf("  Error iSAC Cannot read file %s.\n", "bwe.pcm");
-    cout << flush;
+    std::cout << std::flush;
     exit(1);
   }
 
@@ -472,7 +470,7 @@ int main(int argc, char* argv[]) {
     /* Error check */
     if (err < 0) {
       printf("\n\n Error in create.\n\n");
-      cout << flush;
+      std::cout << std::flush;
       exit(EXIT_FAILURE);
     }
   }
@@ -508,7 +506,7 @@ int main(int argc, char* argv[]) {
   if (testNum != 1) {
     if (WebRtcIsac_EncoderInit(ISAC_main_inst, CodingMode) < 0) {
       printf("Error could not initialize the encoder \n");
-      cout << flush;
+      std::cout << std::flush;
       return 0;
     }
   }
@@ -520,7 +518,7 @@ int main(int argc, char* argv[]) {
       /* exit if returned with error */
       errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
       printf("\n\n Error in initialization (control): %d.\n\n", errtype);
-      cout << flush;
+      std::cout << std::flush;
       if (testNum == 0) {
         exit(EXIT_FAILURE);
       }
@@ -534,7 +532,7 @@ int main(int argc, char* argv[]) {
       errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
 
       printf("\n\n Error in Control BWE: %d.\n\n", errtype);
-      cout << flush;
+      std::cout << std::flush;
       exit(EXIT_FAILURE);
     }
   }
@@ -545,7 +543,7 @@ int main(int argc, char* argv[]) {
       /* exit if returned with error */
       errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
       printf("\n\n Error in SetMaxPayloadSize: %d.\n\n", errtype);
-      cout << flush;
+      std::cout << std::flush;
       exit(EXIT_FAILURE);
     }
   }
@@ -555,14 +553,14 @@ int main(int argc, char* argv[]) {
       /* exit if returned with error */
       errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
       printf("\n\n Error in SetMaxRateInBytes: %d.\n\n", errtype);
-      cout << flush;
+      std::cout << std::flush;
       exit(EXIT_FAILURE);
     }
   }
 
   *speechType = 1;
 
-  cout << "\n" << flush;
+  std::cout << "\n" << std::flush;
 
   length_file = 0;
   int16_t bnIdxTC = 0;
@@ -575,7 +573,7 @@ int main(int argc, char* argv[]) {
       if (err < 0) {
         errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
         printf("\n\n Error in encoderinit: %d.\n\n", errtype);
-        cout << flush;
+        std::cout << std::flush;
       }
 
       WebRtcIsac_DecoderInit(ISAC_main_inst);
@@ -613,7 +611,7 @@ int main(int argc, char* argv[]) {
 
           printf("\nError: Streamsize out of range %d\n",
                  stream_len_int - payloadSize);
-          cout << flush;
+          std::cout << std::flush;
         }
 
         WebRtcIsac_GetUplinkBw(ISAC_main_inst, &sendBN);
@@ -671,7 +669,7 @@ int main(int argc, char* argv[]) {
         /* exit if returned with error */
         errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
         fprintf(stderr, "Error in encoder: %d.\n", errtype);
-        cout << flush;
+        std::cout << std::flush;
         exit(0);
       }
       stream_len = static_cast<size_t>(stream_len_int);
@@ -787,7 +785,7 @@ int main(int argc, char* argv[]) {
           }
 
           printf("Error: in decoder: %d.", errtype);
-          cout << flush;
+          std::cout << std::flush;
           if (testNum == 0) {
             printf("\n\n");
           }
@@ -804,7 +802,7 @@ int main(int argc, char* argv[]) {
           printf("\n\n");
         }
         printf("    Error: in getFrameLen %d.", errtype);
-        cout << flush;
+        std::cout << std::flush;
         if (testNum == 0) {
           printf("\n\n");
         }
@@ -840,7 +838,7 @@ int main(int argc, char* argv[]) {
           printf("\n\n");
         }
         printf("    Error: in decoder %d.", errtype);
-        cout << flush;
+        std::cout << std::flush;
         if (testNum == 0) {
           printf("\n\n");
         }
@@ -851,7 +849,7 @@ int main(int argc, char* argv[]) {
           printf("\n\n");
         }
         printf("    Error: in decoding the transcoded stream");
-        cout << flush;
+        std::cout << std::flush;
         if (testNum == 0) {
           printf("\n\n");
         }