[Extensions] Propagate activeTab hosts to extension background pages

extensions/renderer/tab_finder.h

 // Copyright (c) 2012 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 CHROME_RENDERER_EXTENSIONS_TAB_FINDER_H_
-#define CHROME_RENDERER_EXTENSIONS_TAB_FINDER_H_
+#ifndef EXTENSIONS_RENDERER_TAB_FINDER_H_
+#define EXTENSIONS_RENDERER_TAB_FINDER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/public/renderer/render_view_visitor.h"
 
 namespace content {
 class RenderView;
 }
 
 namespace extensions {
@@ skipping 12 matching lines @@
   bool Visit(content::RenderView* render_view) override;
 
   int tab_id_;
   content::RenderView* view_;
 
   DISALLOW_COPY_AND_ASSIGN(TabFinder);
 };
 
 }  // namespace extensions
 
-#endif  // CHROME_RENDERER_EXTENSIONS_TAB_FINDER_H_
+#endif  // EXTENSIONS_RENDERER_TAB_FINDER_H_