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

chrome/common/extensions/manifest_handlers/shared_module_info.cc

 // Copyright (c) 2013 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/manifest_handlers/shared_module_info.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/version.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "extensions/common/error_utils.h"
 
 using base::DictionaryValue;
 namespace keys = extension_manifest_keys;
 namespace values = extension_manifest_values;
@@ skipping 199 matching lines @@
 const std::vector<std::string> SharedModuleHandler::Keys() const {
   static const char* keys[] = {
     keys::kExport,
     keys::kImport
   };
   return std::vector<std::string>(keys, keys + arraysize(keys));
 }
 
 }  // extensions