Move default_locale manifest handler out of //chrome

chrome/common/extensions/api/i18n/default_locale_handler.h

-// 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.
-
-#ifndef CHROME_COMMON_EXTENSIONS_API_I18N_DEFAULT_LOCALE_HANDLER_H_
-#define CHROME_COMMON_EXTENSIONS_API_I18N_DEFAULT_LOCALE_HANDLER_H_
-
-#include <string>
-
-#include "extensions/common/extension.h"
-#include "extensions/common/manifest_handler.h"
-
-namespace extensions {
-
-// A structure to hold the locale information for an extension.
-struct LocaleInfo : public Extension::ManifestData {
-  // Default locale for fall back. Can be empty if extension is not localized.
-  std::string default_locale;
-
-  static const std::string& GetDefaultLocale(const Extension* extension);
-};
-
-// Parses the "default_locale" manifest key.
-class DefaultLocaleHandler : public ManifestHandler {
- public:
-  DefaultLocaleHandler();
-  ~DefaultLocaleHandler() override;
-
-  bool Parse(Extension* extension, base::string16* error) override;
-
-  // Validates locale info. Doesn't check if messages.json files are valid.
-  bool Validate(const Extension* extension,
-                std::string* error,
-                std::vector<InstallWarning>* warnings) const override;
-
-  bool AlwaysValidateForType(Manifest::Type type) const override;
-
- private:
-  const std::vector<std::string> Keys() const override;
-
-  DISALLOW_COPY_AND_ASSIGN(DefaultLocaleHandler);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_COMMON_EXTENSIONS_API_I18N_DEFAULT_LOCALE_HANDLER_H_