Use a direct include of strings headers in content/renderer and content/shell.

content/shell/renderer/webkit_test_runner.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 "content/shell/renderer/webkit_test_runner.h"
 
 #include <algorithm>
 #include <clocale>
 #include <cmath>
 
 #include "base/base64.h"
 #include "base/debug/debugger.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time.h"
 #include "content/public/renderer/history_item_serialization.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/render_view_visitor.h"
 #include "content/public/test/layouttest_support.h"
 #include "content/shell/common/shell_messages.h"
 #include "content/shell/common/webkit_test_helpers.h"
 #include "content/shell/renderer/shell_render_process_observer.h"
@@ skipping 694 matching lines @@
       ->loadRequest(WebURLRequest(GURL("about:blank")));
   Send(new ShellViewHostMsg_ResetDone(routing_id()));
 }
 
 void WebKitTestRunner::OnNotifyDone() {
   render_view()->GetWebView()->mainFrame()->executeScript(
       WebScriptSource(WebString::fromUTF8("testRunner.notifyDone();")));
 }
 
 }  // namespace content