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/EncodeDecodeTest.h

@@ -107,7 +107,10 @@ class EncodeDecodeTest : public ACMTest {
   uint8_t _testMode;
 
  private:
-  void EncodeToFile(int fileType, int codeId, int* codePars, int testMode);
+  std::string EncodeToFile(int fileType,
+                           int codeId,
+                           int* codePars,
+                           int testMode);
 
  protected:
   Sender _sender;