Use a direct include of strings headers in extensions/, google_apis/, gpu/.

extensions/common/matcher/url_matcher_factory.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 "extensions/common/matcher/url_matcher_factory.h"
 
 #include <algorithm>
 #include <cctype>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "extensions/common/error_utils.h"
 #include "extensions/common/matcher/url_matcher_constants.h"
 #include "extensions/common/matcher/url_matcher_helpers.h"
 #include "third_party/re2/re2/re2.h"
 
 namespace helpers = extensions::url_matcher_helpers;
 namespace keys = extensions::url_matcher_constants;
 
 namespace {
@@ skipping 245 matching lines @@
     } else {
       *error = kInvalidPortRanges;
       return scoped_ptr<URLMatcherPortFilter>(NULL);
     }
   }
 
   return scoped_ptr<URLMatcherPortFilter>(new URLMatcherPortFilter(ranges));
 }
 
 }  // namespace extensions