Use a direct include of strings headers in x/.

chrome/browser/ui/views/extensions/extension_install_dialog_view.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 <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/bundle_installer.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "content/public/browser/page_navigator.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/chromium_strings.h"
@@ skipping 698 matching lines @@
       rotate.Translate(-arrow_view_->width() / 2.0,
                        -arrow_view_->height() / 2.0);
     }
     arrow_view_->SetTransform(rotate);
   }
 }
 
 void IssueAdviceView::ChildPreferredSizeChanged(views::View* child) {
   owner_->SizeToContents();
 }