[Extensions] Pull ExtensionId into its own file

chrome/browser/extensions/api/automation_internal/automation_event_router.cc

 // Copyright 2015 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/api/automation_internal/automation_event_router.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/extensions/api/automation_internal.h"
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/common/extension.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_node_data.h"
 
 namespace extensions {
 
 // static
 AutomationEventRouter* AutomationEventRouter::GetInstance() {
   return base::Singleton<
       AutomationEventRouter,
       base::LeakySingletonTraits<AutomationEventRouter>>::get();
@@ skipping 154 matching lines @@
     // only mark one as active.
     listener.is_active_profile = (extension_id_count == 1 ||
                                   rph->GetBrowserContext() == active_profile_);
 #else
     listener.is_active_profile = true;
 #endif
   }
 }
 
 }  // namespace extensions