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

chrome/common/extensions/extension_constants.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 "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 
 #include <vector>
 
 #include "base/command_line.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "chrome/common/chrome_switches.h"
 #include "net/base/escape.h"
 #include "net/base/url_util.h"
 
 namespace extension_urls {
 
 std::string GetWebstoreLaunchURL() {
   std::string gallery_prefix = kGalleryBrowsePrefix;
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kAppsGalleryURL))
     gallery_prefix = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
@@ skipping 160 matching lines @@
 
 const int kScriptBadgeIconSizes[] = {
   EXTENSION_ICON_BITTY,  // 16
   2 * EXTENSION_ICON_BITTY  // 32
 };
 
 const size_t kNumScriptBadgeIconSizes =
     arraysize(kScriptBadgeIconSizes);
 
 }  // namespace extension_misc