Refactor KeySystems code to call a function to populate the info. (relanding r221932)

content/public/renderer/content_renderer_client.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/public/renderer/content_renderer_client.h"
 
 namespace content {
 
 SkBitmap* ContentRendererClient::GetSadPluginBitmap() {
   return NULL;
@@ skipping 164 matching lines @@
 
 bool ContentRendererClient::AllowBrowserPlugin(
     WebKit::WebPluginContainer* container) {
   return false;
 }
 
 bool ContentRendererClient::AllowPepperMediaStreamAPI(const GURL& url) {
   return false;
 }
 
+void ContentRendererClient::AddKeySystems(
+    std::vector<KeySystemInfo>* key_systems) {
+}
+
 bool ContentRendererClient::ShouldReportDetailedMessageForSource(
     const base::string16& source) const {
   return false;
 }
 
 bool ContentRendererClient::ShouldEnableSiteIsolationPolicy() const {
   return true;
 }
 
 }  // namespace content