Get rid of unnecessary forward declarations in components/autofill/

components/autofill/content/renderer/password_generation_agent.h

 // Copyright 2013 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_AUTOFILL_CONTENT_RENDERER_PASSWORD_GENERATION_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_GENERATION_AGENT_H_
 
 #include <map>
 #include <utility>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/web/WebInputElement.h"
 #include "url/gurl.h"
 
 namespace blink {
-class WebCString;
 class WebDocument;
 }
 
 namespace autofill {
 
 struct FormData;
 struct PasswordForm;
 
 // This class is responsible for controlling communication for password
 // generation between the browser (which shows the popup and generates
@@ skipping 80 matching lines @@
 
   // If this feature is enabled. Controlled by Finch.
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordGenerationAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_GENERATION_AGENT_H_