Drop the restriction on same forward and reverse sample rate on the AudioFrame interface of the APM

webrtc/modules/audio_processing/audio_processing_impl_unittest.cc

Index: webrtc/modules/audio_processing/audio_processing_impl_unittest.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_impl_unittest.cc b/webrtc/modules/audio_processing/audio_processing_impl_unittest.cc
index ed20daaa61ed27ceb2677fde95eecd4a5805b093..965e7eb60b72807e41c7161c589329472115a98c 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl_unittest.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl_unittest.cc
@@ -65,12 +65,10 @@ TEST(AudioProcessingImplTest, AudioParameterChangeTriggersInit) {
   frame.num_channels_ = 2;
   EXPECT_NOERR(mock.AnalyzeReverseStream(&frame));
 
-  // A new sample rate passed to AnalyzeReverseStream should be an error and
-  // not cause an init.
+  // A new sample rate passed to AnalyzeReverseStream should cause an init.
   SetFrameSampleRate(&frame, 16000);
-  EXPECT_CALL(mock, InitializeLocked())
-      .Times(0);
-  EXPECT_EQ(mock.kBadSampleRateError, mock.AnalyzeReverseStream(&frame));
+  EXPECT_CALL(mock, InitializeLocked()).Times(1);
+  EXPECT_NOERR(mock.AnalyzeReverseStream(&frame));
 }
 
 }  // namespace webrtc