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

webkit/common/user_agent/user_agent_util.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 "webkit/common/user_agent/user_agent_util.h"
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <sys/utsname.h>
 #endif
 
 #include "base/lazy_instance.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 // Generated
 #include "webkit_version.h"  // NOLINT
 
 namespace webkit_glue {
@@ skipping 163 matching lines @@
       os_info.c_str(),
       WEBKIT_VERSION_MAJOR,
       WEBKIT_VERSION_MINOR,
       product.c_str(),
       WEBKIT_VERSION_MAJOR,
       WEBKIT_VERSION_MINOR);
   return user_agent;
 }
 
 }  // namespace webkit_glue