blimp: Cleanup class/struct forward declarations

blimp/engine/app/blimp_content_browser_client.h

 // Copyright (c) 2015 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 BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_
 #define BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_
 
 #include "base/macros.h"
 #include "content/public/browser/content_browser_client.h"
 
-namespace content {
-class GeolocationDelegate;
-}  // namespace content
-
 namespace blimp {
 namespace engine {
 
 class BlimpBrowserMainParts;
 class BlimpBrowserContext;
 
 class BlimpContentBrowserClient : public content::ContentBrowserClient {
  public:
   BlimpContentBrowserClient();
   ~BlimpContentBrowserClient() override;
@@ skipping 19 matching lines @@
   // Owned by BrowserMainLoop
   BlimpBrowserMainParts* blimp_browser_main_parts_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpContentBrowserClient);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_