MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/mock_audio_device_factory.cc

 // Copyright 2016 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.
 
-#ifndef AcceptLanguagesResolver_h
-#define AcceptLanguagesResolver_h
+#include "content/renderer/media/mock_audio_device_factory.h"
 
-#include "platform/PlatformExport.h"
-#include "wtf/text/WTFString.h"
+namespace content {
 
-#include <unicode/uscript.h>
+MockCapturerSource::MockCapturerSource() {}
 
-namespace blink {
+MockCapturerSource::~MockCapturerSource() {}
 
-class PLATFORM_EXPORT AcceptLanguagesResolver {
-public:
-    static UScriptCode preferredHanScript() { return m_preferredHanScript; }
-    static const char* preferredHanSkFontMgrLocale()
-    {
-        return m_preferredHanSkFontMgrLocale;
-    }
+void MockCapturerSource::SetVolume(double volume) {}
 
-    static void acceptLanguagesChanged(const String&);
+MockAudioDeviceFactory::MockAudioDeviceFactory()
+    : AudioDeviceFactory(), mock_capturer_source_(new MockCapturerSource()),
+      did_create_once_(false) {}
 
-    static void updateFromAcceptLanguages(const String&);
+MockAudioDeviceFactory::~MockAudioDeviceFactory() {}
 
-private:
-    static UScriptCode m_preferredHanScript;
-    static const char* m_preferredHanSkFontMgrLocale;
-};
+scoped_refptr<media::AudioCapturerSource>
+MockAudioDeviceFactory::CreateAudioCapturerSource(int render_frame_id) {
+  CHECK(!did_create_once_);
+  did_create_once_ = true;
+  return scoped_refptr<media::AudioCapturerSource>(mock_capturer_source_);
+}
 
-} // namespace blink
-
-#endif // AcceptLanguagesResolver_h
+}  // namespace content