Switching WebRTC browser test from AudioManager::HasAudioOutputDevices() to AudioSystem interface.

content/browser/webrtc/webrtc_content_browsertest_base.h

 // Copyright 2014 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 CONTENT_BROWSER_WEBRTC_WEBRTC_CONTENT_BROWSERTEST_BASE_H_
 #define CONTENT_BROWSER_WEBRTC_WEBRTC_CONTENT_BROWSERTEST_BASE_H_
 
 #include "content/public/test/content_browser_test.h"
 
 namespace base {
@@ skipping 27 matching lines @@
                        const std::string& html_file);
 
   // Generates javascript code for a getUserMedia call.
   std::string GenerateGetUserMediaCall(const char* function_name,
                                        int min_width,
                                        int max_width,
                                        int min_height,
                                        int max_height,
                                        int min_frame_rate,
                                        int max_frame_rate) const;
+
+  // Synchronously checks if the system has audio output devices.
+  static bool HasAudioOutputDevices();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEBRTC_WEBRTC_CONTENT_BROWSERTEST_BASE_H_