Ensures that modules_unittests runs on iOS

webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc

Index: webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc
index 80ce082be55f7c669b4f71465091441904b0125a..e5fcee3cc4651ad63f59b2e44815e38a9f757feb 100644
--- a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc
+++ b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest.cc
@@ -503,10 +503,20 @@ class AcmIsacMtTest : public AudioCodingModuleMtTest {
   test::AudioLoop audio_loop_;
 };
 
-TEST_F(AcmIsacMtTest, DoTest) {
+#if defined(WEBRTC_IOS)
+// See https://code.google.com/p/webrtc/issues/detail?id=4752 for details.
+#define MAYBE_DoTest DISABLED_DoTest
+#else
+#define MAYBE_DoTest DoTest
+#endif
+TEST_F(AcmIsacMtTest, MAYBE_DoTest) {
   EXPECT_EQ(kEventSignaled, RunTest());
 }
 
+// Disabling all of these tests on iOS until file support has been added.
+// See https://code.google.com/p/webrtc/issues/detail?id=4752 for details.
+#if !defined(WEBRTC_IOS)
+
 class AcmReceiverBitExactness : public ::testing::Test {
  public:
   static std::string PlatformChecksum(std::string win64,
@@ -963,4 +973,6 @@ TEST_F(AcmSenderBitExactness, MAYBE_Opus_stereo_20ms) {
       test::AcmReceiveTest::kStereoOutput);
 }
 
+#endif
+
 }  // namespace webrtc