Ensures that modules_unittests runs on iOS

webrtc/modules/audio_processing/agc/histogram_unittest.cc

Index: webrtc/modules/audio_processing/agc/histogram_unittest.cc
diff --git a/webrtc/modules/audio_processing/agc/histogram_unittest.cc b/webrtc/modules/audio_processing/agc/histogram_unittest.cc
index d41aacafd854fe98e4831947ddac6f19c75fa5e9..0b05ca978576f012176e0931036f831ad71204ce 100644
--- a/webrtc/modules/audio_processing/agc/histogram_unittest.cc
+++ b/webrtc/modules/audio_processing/agc/histogram_unittest.cc
@@ -17,6 +17,7 @@
 
 #include "gtest/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
+#include "webrtc/test/testsupport/gtest_disable.h"
 #include "webrtc/modules/audio_processing/agc/utility.h"
 
 namespace webrtc {
@@ -89,13 +90,13 @@ void HistogramTest::RunTest(bool enable_circular_buff, const char* filename) {
   fclose(in_file);
 }
 
-TEST_F(HistogramTest, ActiveCircularBuffer) {
+TEST_F(HistogramTest, DISABLED_ON_IOS(ActiveCircularBuffer)) {
   RunTest(true,
           test::ResourcePath("audio_processing/agc/agc_with_circular_buffer",
                              "dat").c_str());
 }
 
-TEST_F(HistogramTest, InactiveCircularBuffer) {
+TEST_F(HistogramTest, DISABLED_ON_IOS(InactiveCircularBuffer)) {
   RunTest(false,
           test::ResourcePath("audio_processing/agc/agc_no_circular_buffer",
                              "dat").c_str());