Disable flaky tests on iOS

webrtc/pc/currentspeakermonitor_unittest.cc

Index: webrtc/pc/currentspeakermonitor_unittest.cc
diff --git a/webrtc/pc/currentspeakermonitor_unittest.cc b/webrtc/pc/currentspeakermonitor_unittest.cc
index 85e4a7d1d78a49dbe0a21a200e39da24e2954c1c..a71f72ed8b040603993b0db2dfff6cfa5414bcbe 100644
--- a/webrtc/pc/currentspeakermonitor_unittest.cc
+++ b/webrtc/pc/currentspeakermonitor_unittest.cc
@@ -122,7 +122,13 @@ TEST_F(CurrentSpeakerMonitorTest, DISABLED_RapidSpeakerChange) {
   EXPECT_EQ(num_changes_, 1);
 }
 
-TEST_F(CurrentSpeakerMonitorTest, SpeakerChange) {
+// Flaky on iOS: webrtc:7057.
+#if defined(WEBRTC_IOS)
+#define MAYBE_SpeakerChange DISABLED_SpeakerChange
+#else
+#define MAYBE_SpeakerChange SpeakerChange
+#endif
+TEST_F(CurrentSpeakerMonitorTest, MAYBE_SpeakerChange) {
   AudioInfo info;
   InitAudioInfo(&info, 0, 0);