Add functionality to get default media device IDs from user preferences.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 2344 matching lines @@
 }
 
 bool WebContentsImpl::CheckMediaAccessPermission(const GURL& security_origin,
                                                  MediaStreamType type) {
   DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          type == MEDIA_DEVICE_VIDEO_CAPTURE);
   return delegate_ &&
          delegate_->CheckMediaAccessPermission(this, security_origin, type);
 }
 
+std::string WebContentsImpl::GetDefaultMediaDeviceId(MediaStreamType type) {
+  if (!delegate_)
+    return std::string();
+  return delegate_->GetDefaultMediaDeviceId(this, type);
+}
+
 SessionStorageNamespace* WebContentsImpl::GetSessionStorageNamespace(
     SiteInstance* instance) {
   return controller_.GetSessionStorageNamespace(instance);
 }
 
 SessionStorageNamespaceMap WebContentsImpl::GetSessionStorageNamespaceMap() {
   return controller_.GetSessionStorageNamespaceMap();
 }
 
 FrameTree* WebContentsImpl::GetFrameTree() {
@@ skipping 3044 matching lines @@
   GetMainFrame()->AddMessageToConsole(
       content::CONSOLE_MESSAGE_LEVEL_WARNING,
       base::StringPrintf("This site does not have a valid SSL "
                          "certificate! Without SSL, your site's and "
                          "visitors' data is vulnerable to theft and "
                          "tampering. Get a valid SSL certificate before"
                          " releasing your website to the public."));
 }
 
 }  // namespace content