Use explicit WebString conversion methods in content/renderer/media (unittests)

content/renderer/media/video_track_recorder_unittest.cc

 // Copyright 2015 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/media/video_track_recorder.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 43 matching lines @@
               kVEAEncoderMinResolutionHeight / 2),
     gfx::Size(kVEAEncoderMinResolutionWidth, kVEAEncoderMinResolutionHeight)};
 static const int kTrackRecorderTestSizeDiff = 20;
 
 class VideoTrackRecorderTest
     : public TestWithParam<
           testing::tuple<VideoTrackRecorder::CodecId, gfx::Size>> {
  public:
   VideoTrackRecorderTest()
       : mock_source_(new MockMediaStreamVideoSource(false)) {
-    const blink::WebString webkit_track_id(base::UTF8ToUTF16("dummy"));
+    const blink::WebString webkit_track_id(
+        blink::WebString::fromASCII("dummy"));
     blink_source_.initialize(webkit_track_id,
                              blink::WebMediaStreamSource::TypeVideo,
                              webkit_track_id);
     blink_source_.setExtraData(mock_source_);
     blink_track_.initialize(blink_source_);
 
     blink::WebMediaConstraints constraints;
     constraints.initialize();
     track_ = new MediaStreamVideoTrack(mock_source_, constraints,
                                        MediaStreamSource::ConstraintsCallback(),
@@ skipping 111 matching lines @@
 
   Mock::VerifyAndClearExpectations(this);
 }
 
 INSTANTIATE_TEST_CASE_P(,
                         VideoTrackRecorderTest,
                         ::testing::Combine(ValuesIn(kTrackRecorderTestCodec),
                                            ValuesIn(kTrackRecorderTestSize)));
 
 }  // namespace content