Remove an include that's no longer necessary (constant moved headers).

chrome/common/platform_util_mac.mm

 // Copyright (c) 2009 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 "chrome/common/platform_util.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/cocoa/tab_window_controller.h"
 #include "chrome/common/l10n_util.h"
-#include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 
 namespace platform_util {
 
 void ShowItemInFolder(const FilePath& full_path) {
   NSString* path_string = base::SysUTF8ToNSString(full_path.value());
   [[NSWorkspace sharedWorkspace] selectFile:path_string
                    inFileViewerRootedAtPath:nil];
 }
 
@@ skipping 14 matching lines @@
 
   return base::SysNSStringToUTF16(title);
 }
 
 bool IsWindowActive(gfx::NativeWindow window) {
   NOTIMPLEMENTED();
   return false;
 }
 
 }  // namespace platform_util