Use a direct include of strings headers in webkit/, part 1.

webkit/common/user_agent/user_agent.cc

 // Copyright 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 "webkit/common/user_agent/user_agent.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/synchronization/lock.h"
 #include "webkit/common/user_agent/user_agent_util.h"
 
 namespace webkit_glue {
 
 namespace {
 
 class UserAgentState {
  public:
   UserAgentState();
@@ skipping 103 matching lines @@
 
 void SetUserAgent(const std::string& user_agent, bool overriding) {
   g_user_agent.Get().Set(user_agent, overriding);
 }
 
 const std::string& GetUserAgent(const GURL& url) {
   return g_user_agent.Get().Get(url);
 }
 
 }  // namespace webkit_glue