Remove unused typemap includes from generated C++ mojo bindings.

content/shell/browser/layout_test/layout_test_notification_manager.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 CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_
 
 #include <stdint.h>
 #include <string>
 #include <unordered_map>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/platform_notification_service.h"
 #include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
 #include "url/gurl.h"
 
+namespace base {
+class NullableString16;
+}
+
 namespace content {
 
 class DesktopNotificationDelegate;
 struct NotificationResources;
 struct PlatformNotificationData;
 
 // Responsible for tracking active notifications and allowed origins for the
 // Web Notification API when running layout tests.
 class LayoutTestNotificationManager : public PlatformNotificationService {
  public:
@@ skipping 69 matching lines @@
   std::unordered_map<std::string, std::string> notification_id_map_;
 
   base::WeakPtrFactory<LayoutTestNotificationManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutTestNotificationManager);
 };
 
 }  // content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_