Add missing (and remove superfluous) 'explicit' from constructors.

webkit/media/webvideoframe_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef WEBKIT_MEDIA_WEBVIDEOFRAME_IMPL_H_
 #define WEBKIT_MEDIA_WEBVIDEOFRAME_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "media/base/video_frame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebRect.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebSize.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebVideoFrame.h"
 
 namespace webkit_media {
 
 class WebVideoFrameImpl : public WebKit::WebVideoFrame {
  public:
   // This converts a WebKit::WebVideoFrame to a media::VideoFrame.
   static media::VideoFrame* toVideoFrame(
       WebKit::WebVideoFrame* web_video_frame);
 
-  WebVideoFrameImpl(scoped_refptr<media::VideoFrame> video_frame);
+  explicit WebVideoFrameImpl(scoped_refptr<media::VideoFrame> video_frame);
   virtual ~WebVideoFrameImpl();
   virtual WebVideoFrame::Format format() const;
   virtual unsigned planes() const;
   virtual const void* data(unsigned plane) const;
   virtual unsigned textureId() const;
   virtual unsigned textureTarget() const;
   virtual WebKit::WebRect visibleRect() const;
   virtual WebKit::WebSize textureSize() const;
 
  private:
   scoped_refptr<media::VideoFrame> video_frame_;
   DISALLOW_COPY_AND_ASSIGN(WebVideoFrameImpl);
 };
 
 // TODO(skaslev) This is temporarily inline pending the removal of
 // WebKit::WebVideoFrame and WebVideoFrameImpl which are currently unused.
 inline media::VideoFrame* WebVideoFrameImpl::toVideoFrame(
     WebKit::WebVideoFrame* web_video_frame) {
   WebVideoFrameImpl* wrapped_frame =
       static_cast<WebVideoFrameImpl*>(web_video_frame);
   if (wrapped_frame)
     return wrapped_frame->video_frame_.get();
   return NULL;
 }
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_WEBVIDEOFRAME_IMPL_H_