Revert of [blink] Unique pointers in Platform.h

content/renderer/render_thread_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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 630 matching lines @@
       new CacheStorageDispatcher(thread_safe_sender()));
 
   // Note: This may reorder messages from the ResourceDispatcher with respect to
   // other subsystems.
   resource_dispatch_throttler_.reset(new ResourceDispatchThrottler(
       static_cast<RenderThread*>(this), renderer_scheduler_.get(),
       base::TimeDelta::FromSecondsD(kThrottledResourceRequestFlushPeriodS),
       kMaxResourceRequestsPerFlushWhenThrottled));
   resource_dispatcher()->set_message_sender(resource_dispatch_throttler_.get());
 
+  media_stream_center_ = nullptr;
+
   blob_message_filter_ = new BlobMessageFilter(GetFileThreadTaskRunner());
   AddFilter(blob_message_filter_.get());
   db_message_filter_ = new DBMessageFilter();
   AddFilter(db_message_filter_.get());
 
   vc_manager_.reset(new VideoCaptureImplManager());
 
   browser_plugin_manager_.reset(new BrowserPluginManager());
   AddObserver(browser_plugin_manager_.get());
 
@@ skipping 1306 matching lines @@
 }
 
 std::unique_ptr<cc::SwapPromise>
 RenderThreadImpl::RequestCopyOfOutputForLayoutTest(
     int32_t routing_id,
     std::unique_ptr<cc::CopyOutputRequest> request) {
   DCHECK(layout_test_deps_);
   return layout_test_deps_->RequestCopyOfOutput(routing_id, std::move(request));
 }
 
-std::unique_ptr<blink::WebMediaStreamCenter>
-RenderThreadImpl::CreateMediaStreamCenter(
+blink::WebMediaStreamCenter* RenderThreadImpl::CreateMediaStreamCenter(
     blink::WebMediaStreamCenterClient* client) {
-  std::unique_ptr<blink::WebMediaStreamCenter> media_stream_center;
 #if BUILDFLAG(ENABLE_WEBRTC)
-  if (!media_stream_center) {
-    media_stream_center =
-        GetContentClient()->renderer()->OverrideCreateWebMediaStreamCenter(
-            client);
-    if (!media_stream_center) {
-      media_stream_center = base::MakeUnique<MediaStreamCenter>(
-          client, GetPeerConnectionDependencyFactory());
+  if (!media_stream_center_) {
+    media_stream_center_ = GetContentClient()->renderer()
+        ->OverrideCreateWebMediaStreamCenter(client);
+    if (!media_stream_center_) {
+      std::unique_ptr<MediaStreamCenter> media_stream_center(
+          new MediaStreamCenter(client, GetPeerConnectionDependencyFactory()));
+      media_stream_center_ = media_stream_center.release();
     }
   }
 #endif
-  return media_stream_center;
+  return media_stream_center_;
 }
 
 #if BUILDFLAG(ENABLE_WEBRTC)
 PeerConnectionDependencyFactory*
 RenderThreadImpl::GetPeerConnectionDependencyFactory() {
   return peer_connection_factory_.get();
 }
 #endif
 
 mojom::RenderFrameMessageFilter*
@@ skipping 403 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content