Adds proper IPC usage for AudioDevice::GetAudioHardwareBufferSize().

content/renderer/media/audio_device.cc

Index: content/renderer/media/audio_device.cc
===================================================================
--- content/renderer/media/audio_device.cc	(revision 108984)
+++ content/renderer/media/audio_device.cc	(working copy)
@@ -213,7 +213,6 @@
   while ((sizeof(pending_data) == socket_->Receive(&pending_data,
                                                    sizeof(pending_data))) &&
          (pending_data >= 0)) {
-
     // Convert the number of pending bytes in the render buffer
     // into milliseconds.
     audio_delay_milliseconds_ = pending_data / bytes_per_ms;
@@ -249,8 +248,10 @@
   // Uses cached value if possible.
   static size_t buffer_size = 0;
 
-  if (!buffer_size)
-    buffer_size = media::GetAudioHardwareBufferSize();
+  if (!buffer_size) {
+    RenderThreadImpl::current()->Send(
+        new ViewHostMsg_GetHardwareBufferSize(&buffer_size));
+  }
 
   return buffer_size;
 }