Intiialize AudioManager and related class lazily

content/browser/media/capture/image_capture_impl.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.
 
 #include "content/browser/media/capture/image_capture_impl.h"
 
 #include "base/bind_helpers.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/video_capture_manager.h"
@@ skipping 87 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   media::ScopedResultCallback<TakePhotoCallback> scoped_callback(
       base::Bind(&RunTakePhotoCallbackOnUIThread, callback),
       media::BindToCurrentLoop(base::Bind(&RunFailedTakePhotoCallback)));
 
   // media_stream_manager() can only be called on UI thread.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&TakePhotoOnIOThread, source_id,
-                 BrowserMainLoop::GetInstance()->media_stream_manager(),
+                 BrowserMainLoop::GetInstance()->GetMediaStreamManager(),
                  base::Passed(&scoped_callback)));
 }
 
 ImageCaptureImpl::ImageCaptureImpl(
     mojo::InterfaceRequest<media::mojom::ImageCapture> request)
     : binding_(this, std::move(request)) {}
 
 }  // namespace content