Cleanup: Remove unneeded headers from app/

chrome/browser/platform_util_linux.cc

 // 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/browser/platform_util.h"
 
 #include <gtk/gtk.h>
 
-#include "app/gtk_util.h"
 #include "base/file_util.h"
 #include "base/process_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/process_watcher.h"
 #include "googleurl/src/gurl.h"
 
 namespace {
 
 void XDGOpen(const std::string& path) {
   std::vector<std::string> argv;
@@ skipping 39 matching lines @@
 
 void OpenItem(const FilePath& full_path) {
   XDGOpen(full_path.value());
 }
 
 void OpenExternal(const GURL& url) {
   XDGOpen(url.spec());
 }
 
 }  // namespace platform_util