Make AudioParameters a class instead of a struct

content/browser/renderer_host/media/audio_input_renderer_host.h

Index: content/browser/renderer_host/media/audio_input_renderer_host.h
diff --git a/content/browser/renderer_host/media/audio_input_renderer_host.h b/content/browser/renderer_host/media/audio_input_renderer_host.h
index a7645514a2ba9e1dfcf501ddc102eb323a70c07e..b89e9608a718c9631f156adacb0bf5d944707e8e 100644
--- a/content/browser/renderer_host/media/audio_input_renderer_host.h
+++ b/content/browser/renderer_host/media/audio_input_renderer_host.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
@@ -69,7 +69,7 @@ class ResourceContext;
 }
 
 class AudioManager;
-struct AudioParameters;
+class AudioParameters;
 
 class CONTENT_EXPORT AudioInputRendererHost
     : public content::BrowserMessageFilter,