Revert of [blink] Unique pointers in Platform.h

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 67a6675332266a2454730672b7ec86ea92a5c6ff..8ca048bea8209844613c3d06e552c9494df43d50 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -334,7 +334,7 @@
 
   // Creates the embedder implementation of WebMediaStreamCenter.
   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
-  std::unique_ptr<blink::WebMediaStreamCenter> CreateMediaStreamCenter(
+  blink::WebMediaStreamCenter* CreateMediaStreamCenter(
       blink::WebMediaStreamCenterClient* client);
 
   BrowserPluginManager* browser_plugin_manager() const {
@@ -607,6 +607,9 @@
   std::unique_ptr<ResourceDispatchThrottler> resource_dispatch_throttler_;
   std::unique_ptr<CacheStorageDispatcher> main_thread_cache_storage_dispatcher_;
 
+  // Used on the render thread and deleted by WebKit at shutdown.
+  blink::WebMediaStreamCenter* media_stream_center_;
+
   // Used on the renderer and IPC threads.
   scoped_refptr<BlobMessageFilter> blob_message_filter_;
   scoped_refptr<DBMessageFilter> db_message_filter_;