Clean up old Mojo types for mojom::Receiver

This CL cleans up old Mojo types for mojom::Receiver using
Receiver.

Bug: 955171
Change-Id: I5ad59189f2759a6df51d768dedf78d1dd95d18c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890382Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#711535}

services/video_capture/video_source_impl.cc

@@ -104,12 +104,9 @@ void VideoSourceImpl::OnCreateDeviceResponse(
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   switch (result_code) {
     case mojom::DeviceAccessResultCode::SUCCESS: {
-      mojo::PendingRemote<mojom::Receiver> broadcaster_as_receiver;
-      broadcaster_binding_ = std::make_unique<mojo::Binding<mojom::Receiver>>(
-          &broadcaster_,
-          broadcaster_as_receiver.InitWithNewPipeAndPassReceiver());
+      broadcaster_receiver_.reset();
       device_->Start(device_start_settings_,
-                     std::move(broadcaster_as_receiver));
+                     broadcaster_receiver_.BindNewPipeAndPassRemote());
       device_status_ = DeviceStatus::kStarted;
       if (push_subscriptions_.empty()) {
         StopDeviceAsynchronously();

services/video_capture/video_source_impl.h

@@ -12,6 +12,7 @@
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/pending_receiver.h"
 #include "mojo/public/cpp/bindings/pending_remote.h"
+#include "mojo/public/cpp/bindings/receiver.h"
 #include "mojo/public/cpp/bindings/remote.h"
 #include "services/video_capture/broadcasting_receiver.h"
 #include "services/video_capture/device_factory_media_to_mojo_adapter.h"
@@ -68,7 +69,7 @@ class VideoSourceImpl : public mojom::VideoSource {
            std::unique_ptr<PushVideoStreamSubscriptionImpl>>
       push_subscriptions_;
   BroadcastingReceiver broadcaster_;
-  std::unique_ptr<mojo::Binding<mojom::Receiver>> broadcaster_binding_;
+  mojo::Receiver<mojom::Receiver> broadcaster_receiver_{&broadcaster_};
   DeviceStatus device_status_;
   mojo::Remote<mojom::Device> device_;
   media::VideoCaptureParams device_start_settings_;