extensions: Cleanup class/struct fwd declarations

extensions/common/extension_l10n_util.h

 // Copyright 2014 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.
 //
 // This file declares extension specific l10n utils.
 
 #ifndef EXTENSIONS_COMMON_EXTENSION_L10N_UTIL_H_
 #define EXTENSIONS_COMMON_EXTENSION_L10N_UTIL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 }
 
 namespace extensions {
-struct ExtensionInfo;
 class MessageBundle;
 }
 
 namespace extension_l10n_util {
 
 // Set the locale for this process to a fixed value, rather than using the
 // normal file-based lookup mechanisms. This is used to set the locale inside
 // the sandboxed utility process, where file reading is not allowed.
 void SetProcessLocale(const std::string& locale);
 
@@ skipping 90 matching lines @@
 
   ~ScopedLocaleForTest();
 
  private:
   std::string locale_;  // The current locale at ctor time.
 };
 
 }  // namespace extension_l10n_util
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_L10N_UTIL_H_