Move BackgroundContents to the directory in which it belongs.

chrome/browser/background/background_contents.h

 // Copyright (c) 2011 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_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
-#define CHROME_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
+#ifndef CHROME_BROWSER_BACKGROUND_BACKGROUND_CONTENTS_H_
+#define CHROME_BROWSER_BACKGROUND_BACKGROUND_CONTENTS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/base/window_open_disposition.h"
 
 class Profile;
 
 namespace content {
 class SessionStorageNamespace;
 class SiteInstance;
 };
 
-// This class consumes WebContents. It can host a renderer, but does not
-// have any visible display.
+// This class maintains a WebContents used in the background. It can host a
+// renderer, but does not have any visible display.
+// TODO(atwilson): Unify this with background pages; http://crbug.com/77790
 class BackgroundContents : public content::WebContentsDelegate,
                            public content::WebContentsObserver,
                            public content::NotificationObserver {
  public:
   class Delegate {
    public:
     // Called by AddNewContents(). Asks the delegate to attach the opened
     // WebContents to a suitable container (e.g. browser) or to show it if it's
     // a popup window. If |was_blocked| is non-NULL, then |*was_blocked| will be
     // set to true if the popup gets blocked, and left unchanged otherwise.
@@ skipping 59 matching lines @@
   // The BackgroundContents object that has just been opened.
   BackgroundContents* contents;
 
   // The name of the parent frame for these contents.
   const base::string16& frame_name;
 
   // The ID of the parent application (if any).
   const base::string16& application_id;
 };
 
-#endif  // CHROME_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
+#endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_CONTENTS_H_