Eliminate unnecessary forward declarations from components/password_manager

components/password_manager/core/browser/password_manager_internals_service.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 COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_MANAGER_INTERNALS_SERVICE_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_MANAGER_INTERNALS_SERVICE_H_
 
 #include <string>
 
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/password_manager/core/browser/log_router.h"
 
-namespace content {
-class BrowserContext;
-}
-
 namespace password_manager {
 
 // Collects the logs for the password manager internals page and distributes
 // them to all open tabs with the internals page.
 class PasswordManagerInternalsService : public KeyedService,
                                         public LogRouter {
  public:
   // There are only two ways in which the service depends on the BrowserContext:
   // 1) There is one service per each non-incognito BrowserContext.
   // 2) No service will be created for an incognito BrowserContext.
   // Both properties are guarantied by the BrowserContextKeyedFactory framework,
   // so the service itself does not need the context on creation.
   PasswordManagerInternalsService();
   ~PasswordManagerInternalsService() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PasswordManagerInternalsService);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_MANAGER_INTERNALS_SERVICE_H_