Eliminate MediaPlayer & MediaPlayerClient abstractions

public/platform/WebMediaPlayerEncryptedMediaClient.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebMediaPlayerEncryptedMediaClient_h
 #define WebMediaPlayerEncryptedMediaClient_h
 
+#include "WebCommon.h"
+#include "WebEncryptedMediaTypes.h"
+
 namespace blink {
 
-class WebMediaPlayerEncryptedMediaClient {
+class WebString;
+class WebURL;
+
+class BLINK_PLATFORM_EXPORT WebMediaPlayerEncryptedMediaClient {
 public:
     enum MediaKeyErrorCode {
         MediaKeyErrorCodeUnknown = 1,
         MediaKeyErrorCodeClient,
         MediaKeyErrorCodeService,
         MediaKeyErrorCodeOutput,
         MediaKeyErrorCodeHardwareChange,
         MediaKeyErrorCodeDomain
     };
 
     virtual void keyAdded(const WebString& keySystem, const WebString& sessionId) = 0;
     virtual void keyError(const WebString& keySystem, const WebString& sessionId, MediaKeyErrorCode, unsigned short systemCode) = 0;
     virtual void keyMessage(const WebString& keySystem, const WebString& sessionId, const unsigned char* message, unsigned messageLength, const WebURL& defaultURL) = 0;
     virtual void encrypted(WebEncryptedMediaInitDataType, const unsigned char* initData, unsigned initDataLength) = 0;
     virtual void didBlockPlaybackWaitingForKey() = 0;
     virtual void didResumePlaybackBlockedForKey() = 0;
 
 protected:
     ~WebMediaPlayerEncryptedMediaClient() { }
 };
 
 } // namespace blink
 
 #endif