Restore sample_rate_hz() until Chromium is updated to not use it.

TBR=bjornv
TESTED=Chromium builds against webrtc head.
BUG=2894

Review URL: https://webrtc-codereview.appspot.com/12349004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5962 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index 005b3f7..147cb18 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -312,6 +312,11 @@
   return fwd_in_format_.rate();
 }
 
+int AudioProcessingImpl::sample_rate_hz() const {
+  CriticalSectionScoped crit_scoped(crit_);
+  return fwd_in_format_.rate();
+}
+
 int AudioProcessingImpl::proc_sample_rate_hz() const {
   return fwd_proc_format_.rate();
 }