Revert of [blink] Unique pointers in Platform.h

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 66c81ece0095c5d9486cc4cddd1ad14f7ff6012f..096997042ba104fc3b2d6947e06f55c138da8e5f 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -648,6 +648,8 @@
       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();
@@ -1982,22 +1984,20 @@
   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)