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 f7abb5f850c1d2f0ec22724e39cef62da46d1d2e..483f7c05a025d731a7ca4dcb2b7f11c340b00c76 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -333,7 +333,7 @@
 
   // 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 {
@@ -606,6 +606,9 @@
   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_;