Fix parallelizability in modules_tests.

R=henrik.lundin@webrtc.org
BUG=3873
TEST=third_party/gtest-parallel/gtest-parallel -r 10 -w 64 out/Debug/modules_tests

Review URL: https://webrtc-codereview.appspot.com/24799004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7354 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/main/test/PacketLossTest.cc

@@ -131,7 +131,8 @@ void PacketLossTest::Perform() {
   int codec_id = acm->Codec("opus", 48000, channels_);
 
   RTPFile rtpFile;
-  std::string fileName = webrtc::test::OutputPath() + "outFile.rtp";
+  std::string fileName = webrtc::test::TempFilename(webrtc::test::OutputPath(),
+                                                    "packet_loss_test");
 
   // Encode to file
   rtpFile.Open(fileName.c_str(), "wb+");