Fix modules_unittests on iOS.

webrtc/modules/audio_processing/test/debug_dump_test.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 498 matching lines @@
   generator.StartRecording();
   generator.Process(100);
 
   EXPECT_EQ(AudioProcessing::kNoError,
             aec->set_suppression_level(EchoCancellation::kHighSuppression));
   generator.Process(100);
   generator.StopRecording();
   VerifyDebugDump(generator.dump_file_name());
 }
 
-#if defined(WEBRTC_ANDROID)
-// AGC may not be supported on Android.
+// AGC is not supported on Android or iOS.
+#if defined(WEBRTC_ANDROID) || defined(WEBRTC_IOS)
 #define MAYBE_ToggleAgc DISABLED_ToggleAgc
 #else
 #define MAYBE_ToggleAgc ToggleAgc
 #endif
 TEST_F(DebugDumpTest, MAYBE_ToggleAgc) {
   Config config;
   DebugDumpGenerator generator(config, AudioProcessing::Config());
   generator.StartRecording();
   generator.Process(100);
 
@@ skipping 24 matching lines @@
   config.Set<ExperimentalNs>(new ExperimentalNs(true));
   DebugDumpGenerator generator(config, AudioProcessing::Config());
   generator.StartRecording();
   generator.Process(100);
   generator.StopRecording();
   VerifyDebugDump(generator.dump_file_name());
 }
 
 }  // namespace test
 }  // namespace webrtc