Use explicit conversion to base::Optional in MSVS::GetCurrentFormatImpl implementations.

content/renderer/pepper/pepper_media_stream_video_track_host.cc

 // Copyright 2014 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/pepper/pepper_media_stream_video_track_host.h"
 
 #include <stddef.h>
 
 #include "base/base64.h"
 #include "base/logging.h"
@@ skipping 429 matching lines @@
   void StopSourceImpl() final {
     if (host_)
       host_->frame_deliverer_ = nullptr;
   }
 
  private:
   base::Optional<media::VideoCaptureFormat> GetCurrentFormatImpl()
       const override {
     DCHECK(!IsOldVideoConstraints());
     if (host_) {
-      return media::VideoCaptureFormat(
-          host_->plugin_frame_size_, kDefaultOutputFrameRate,
-          ToPixelFormat(host_->plugin_frame_format_));
+      return base::Optional<media::VideoCaptureFormat>(
+          media::VideoCaptureFormat(
+              host_->plugin_frame_size_, kDefaultOutputFrameRate,
+              ToPixelFormat(host_->plugin_frame_format_)));
     }
     return base::Optional<media::VideoCaptureFormat>();
   }
 
   const base::WeakPtr<PepperMediaStreamVideoTrackHost> host_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoSource);
 };
 
 void PepperMediaStreamVideoTrackHost::DidConnectPendingHostToResource() {
@@ skipping 80 matching lines @@
 }
 
 void PepperMediaStreamVideoTrackHost::OnTrackStarted(
     MediaStreamSource* source,
     MediaStreamRequestResult result,
     const blink::WebString& result_name) {
   DVLOG(3) << "OnTrackStarted result: " << result;
 }
 
 }  // namespace content