Make AudioParameters a class instead of a struct

content/content_common.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../gpu/gpu.gyp:gles2_implementation',
     '../gpu/gpu.gyp:gpu_ipc',
@@ skipping 215 matching lines @@
     'common/inter_process_time_ticks_converter.h',
     'common/intents_messages.h',
     'common/java_bridge_messages.h',
     'common/mac/attributed_string_coder.h',
     'common/mac/attributed_string_coder.mm',
     'common/mac/font_descriptor.h',
     'common/mac/font_descriptor.mm',
     'common/mac/font_loader.h',
     'common/mac/font_loader.mm',
     'common/media/audio_messages.h',
+    'common/media/audio_param_traits.cc',
+    'common/media/audio_param_traits.h',
     'common/media/audio_stream_state.h',
     'common/media/media_stream_messages.h',
     'common/media/media_stream_options.cc',
     'common/media/media_stream_options.h',
     'common/media/video_capture.h',
     'common/media/video_capture_messages.h',
     'common/message_router.cc',
     'common/message_router.h',
     'common/mime_registry_messages.h',
     'common/navigation_gesture.h',
@@ skipping 184 matching lines @@
         '../build/extract_from_cab.py',
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
       },
      ]
     }]
   ],
 }