[Extensions] Pull ExtensionId into its own file

chrome/browser/extensions/extension_management.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_management.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 10 matching lines @@
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "chrome/browser/extensions/permissions_based_management_policy_provider.h"
 #include "chrome/browser/extensions/standard_management_policy_provider.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/crx_file/id_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_service.h"
 #include "extensions/browser/pref_names.h"
+#include "extensions/common/extension.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/permission_set.h"
 #include "extensions/common/url_pattern.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 ExtensionManagement::ExtensionManagement(PrefService* pref_service)
     : pref_service_(pref_service) {
@@ skipping 452 matching lines @@
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 void ExtensionManagementFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterDictionaryPref(pref_names::kExtensionManagement);
 }
 
 }  // namespace extensions