Use explicit WebString <-> string{16,} conversion methods in content/renderer/pepper

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 499 matching lines @@
   // source id instead of track id is used there.
   const std::string id = track_.source().id().utf8();
   context->reply_msg = PpapiPluginMsg_MediaStreamVideoTrack_ConfigureReply(id);
   return PP_OK;
 }
 
 void PepperMediaStreamVideoTrackHost::InitBlinkTrack() {
   std::string source_id;
   base::Base64Encode(base::RandBytesAsString(64), &source_id);
   blink::WebMediaStreamSource webkit_source;
-  webkit_source.initialize(base::UTF8ToUTF16(source_id),
+  webkit_source.initialize(blink::WebString::fromASCII(source_id),
                            blink::WebMediaStreamSource::TypeVideo,
-                           base::UTF8ToUTF16(kPepperVideoSourceName),
+                           blink::WebString::fromASCII(kPepperVideoSourceName),

[kinuko, 2016/12/22 06:53:21]

Looks like source_id (which is base64 encoded string) and kPepperVideoSourceName
are both ascii-only

                            false /* remote */);
   MediaStreamVideoSource* const source =
       new VideoSource(weak_factory_.GetWeakPtr());
   webkit_source.setExtraData(source);  // Takes ownership of |source|.
 
   const bool enabled = true;
   blink::WebMediaConstraints constraints;
   constraints.initialize();
   track_ = MediaStreamVideoTrack::CreateVideoTrack(
        source, constraints,
        base::Bind(
            &PepperMediaStreamVideoTrackHost::OnTrackStarted,
            base::Unretained(this)),
        enabled);
   // Note: The call to CreateVideoTrack() returned a track that holds a
   // ref-counted reference to |webkit_source| (and, implicitly, |source|).
 }
 
 void PepperMediaStreamVideoTrackHost::OnTrackStarted(
     MediaStreamSource* source,
     MediaStreamRequestResult result,
     const blink::WebString& result_name) {
   DVLOG(3) << "OnTrackStarted result: " << result;
 }
 
 }  // namespace content