Made MediaFilter::host_ and MediaFilter::message_loop_ private.

media/filters/audio_renderer_base.cc

Index: media/filters/audio_renderer_base.cc
diff --git a/media/filters/audio_renderer_base.cc b/media/filters/audio_renderer_base.cc
index 43f79ca86ea0cad62b6cb7e273602f5d6c3526b4..ba52fe0843db4c820fb34567c2d8120370b50650 100644
--- a/media/filters/audio_renderer_base.cc
+++ b/media/filters/audio_renderer_base.cc
@@ -89,10 +89,10 @@ void AudioRendererBase::OnReadComplete(Buffer* buffer_in) {
     if (queue_.empty()) {
       // If we say we have initialized but buffer queue is empty, raise an
       // error.
-      host_->Error(PIPELINE_ERROR_NO_DATA);
+      host()->Error(PIPELINE_ERROR_NO_DATA);
     } else {
       initialized_ = true;
-      host_->InitializationComplete();
+      host()->InitializationComplete();
     }
   }
 }
@@ -210,7 +210,7 @@ size_t AudioRendererBase::FillBuffer(uint8* dest,
     // finer time update events.
     if (playback_delay < last_fill_buffer_time)
       last_fill_buffer_time -= playback_delay;
-    host_->SetTime(last_fill_buffer_time);
+    host()->SetTime(last_fill_buffer_time);
   }
 
   return dest_written;