chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/api/automation_internal/automation_internal_api.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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_INTERNAL_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_INTERNAL_API_H_
 
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
-namespace content {
-struct AXEventNotificationDetails;
-}  // namespace content
-
 namespace extensions {
 class AutomationActionAdapter;
 
 namespace api {
 namespace automation_internal {
 namespace PerformAction {
 struct Params;
 }  // namespace PerformAction
 }  // namespace automation_internal
 }  // namespace api
 }  // namespace extensions
 
-namespace ui {
-struct AXNodeData;
-}
-
 namespace extensions {
 
 // Implementation of the chrome.automation API.
 class AutomationInternalEnableTabFunction
     : public ChromeUIThreadExtensionFunction {
   DECLARE_EXTENSION_FUNCTION("automationInternal.enableTab",
                              AUTOMATIONINTERNAL_ENABLETAB)
  protected:
   ~AutomationInternalEnableTabFunction() override {}
 
@@ skipping 53 matching lines @@
   void OnResponse(const std::string& error, int result_acc_obj_id);
 
   // Used for assigning a unique ID to each request so that the response can be
   // routed appropriately.
   static int query_request_id_counter_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_INTERNAL_API_H_