Cleanup: Remove unnecessary forward declarations from some views files.

include/views/SkOSWindow_Android.h

-
 /*
  * Copyright 2011 Skia
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-
 #ifndef SkOSWindow_Android_DEFINED
 #define SkOSWindow_Android_DEFINED
 
 #include "SkWindow.h"
 
-struct SkIRect;
-
 class SkOSWindow : public SkWindow {
 public:
     SkOSWindow(void*) {}
     ~SkOSWindow() {}
 
     enum SkBackEndTypes {
         kNone_BackEndType,
         kNativeGL_BackEndType,
     };
 
@@ skipping 12 matching lines @@
 protected:
     // overrides from SkWindow
     virtual void onHandleInval(const SkIRect&);
     virtual void onSetTitle(const char title[]);
 
 private:
     typedef SkWindow INHERITED;
 };
 
 #endif