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

content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc

Index: content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc
diff --git a/content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc b/content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc
index 64e0da19393f3a6f7f638b3aac3d05803023286d..6752973ee99698d711c8db90eed96706d2526ffb 100644
--- a/content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc
+++ b/content/renderer/media/webrtc/media_stream_remote_video_source_unittest.cc
@@ -47,9 +47,9 @@ class MediaStreamRemoteVideoSourceTest
                                   webrtc_video_track_.get())))),
         number_of_successful_constraints_applied_(0),
         number_of_failed_constraints_applied_(0) {
-    webkit_source_.initialize(base::UTF8ToUTF16("dummy_source_id"),
+    webkit_source_.initialize(blink::WebString::fromASCII("dummy_source_id"),
                               blink::WebMediaStreamSource::TypeVideo,
-                              base::UTF8ToUTF16("dummy_source_name"),
+                              blink::WebString::fromASCII("dummy_source_name"),
                               true /* remote */);
     webkit_source_.setExtraData(remote_source_);
   }