some fixes and warning disables in ui/ for building on win x64

ui/base/win/dpi.cc

 // 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.
 
 #include "ui/base/win/dpi.h"
 
 #include <windows.h>
 
 #include "base/win/scoped_hdc.h"
 
@@ skipping 29 matching lines @@
 }
 
 bool IsInHighDPIMode() {
   gfx::Size dpi(GetDPI());
   return dpi.width() > kDefaultDPIX || dpi.height() > kDefaultDPIY;
 }
 
 void EnableHighDPISupport() {
   typedef BOOL(WINAPI *SetProcessDPIAwarePtr)(VOID);
   SetProcessDPIAwarePtr set_process_dpi_aware_func =
-      GetProcAddress(GetModuleHandleA("user32.dll"), "SetProcessDPIAware");
+      reinterpret_cast<SetProcessDPIAwarePtr>(
+          GetProcAddress(GetModuleHandleA("user32.dll"), "SetProcessDPIAware"));
   if (set_process_dpi_aware_func)
     set_process_dpi_aware_func();
 }
 
 }  // namespace ui