extensions: Cleanup class/struct fwd declarations

extensions/browser/api/webcam_private/webcam_private_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 EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_WEBCAM_PRIVATE_API_H_
 #define EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_WEBCAM_PRIVATE_API_H_
 
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "extensions/browser/api/api_resource_manager.h"
 #include "extensions/browser/api/webcam_private/webcam.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_function.h"
 #include "extensions/browser/process_manager_observer.h"
 
-class Profile;
-
 namespace extensions {
 
-class ProcessManager;
-
 class WebcamPrivateAPI : public BrowserContextKeyedAPI {
  public:
   static BrowserContextKeyedAPIFactory<WebcamPrivateAPI>* GetFactoryInstance();
 
   // Convenience method to get the WebcamPrivateAPI for a BrowserContext.
   static WebcamPrivateAPI* Get(content::BrowserContext* context);
 
   explicit WebcamPrivateAPI(content::BrowserContext* context);
   ~WebcamPrivateAPI() override;
 
@@ skipping 133 matching lines @@
 
  private:
   void OnResetWebcam(bool success);
 
   DISALLOW_COPY_AND_ASSIGN(WebcamPrivateResetFunction);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_WEBCAM_PRIVATE_API_H_