Clean up a remained old Mojo type use of CompositingModeReporter

This CL converts CompositingModeReporterPtr to
mojo::Remote<viz::mojom::CompositingModeReporter>
in RenderThreadImpl.

Bug: 955171
Change-Id: If36579920d065b49e539c37a17a37b2782f5f6fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896491Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#712376}

content/renderer/render_thread_impl.cc

@@ -970,7 +970,7 @@ void RenderThreadImpl::Init() {
   BindHostReceiver(frame_sink_provider_.BindNewPipeAndPassReceiver());
 
   if (!is_gpu_compositing_disabled_) {
-    BindHostReceiver(mojo::MakeRequest(&compositing_mode_reporter_));
+    BindHostReceiver(compositing_mode_reporter_.BindNewPipeAndPassReceiver());
 
     compositing_mode_reporter_->AddCompositingModeWatcher(
         compositing_mode_watcher_receiver_.BindNewPipeAndPassRemote());

content/renderer/render_thread_impl.h

@@ -691,7 +691,7 @@ class CONTENT_EXPORT RenderThreadImpl
   mojo::Remote<mojom::FrameSinkProvider> frame_sink_provider_;
 
   // A mojo connection to the CompositingModeReporter service.
-  viz::mojom::CompositingModeReporterPtr compositing_mode_reporter_;
+  mojo::Remote<viz::mojom::CompositingModeReporter> compositing_mode_reporter_;
   // The class is a CompositingModeWatcher, which is bound to mojo through
   // this member.
   mojo::Receiver<viz::mojom::CompositingModeWatcher>