Remove windows/mac/ios specific code from //ui

ui/platform_window/platform_window.h

 // Copyright 2014 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 UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_
 #define UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace gfx {
 class Rect;
 }
 
-#if defined(OS_WIN)
-typedef struct HINSTANCE__* HINSTANCE;
-typedef struct HICON__* HICON;
-typedef HICON HCURSOR;
-#endif
-
 namespace ui {
 
-#if defined(OS_WIN)
-typedef ::HCURSOR PlatformCursor;
-#elif defined(USE_X11)
+#if defined(USE_X11)
 typedef unsigned long PlatformCursor;
 #else
 typedef void* PlatformCursor;
 #endif
 
 class PlatformWindowDelegate;
 
 // Platform window.
 //
 // Each instance of PlatformWindow represents a single window in the
@@ skipping 19 matching lines @@
   virtual void Minimize() = 0;
   virtual void Restore() = 0;
 
   virtual void SetCursor(PlatformCursor cursor) = 0;
   virtual void MoveCursorTo(const gfx::Point& location) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_