Revert of DevTools: Remove pageAgent() call from DebuggerModel

Source/devtools/devtools.gypi

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 259 matching lines @@
             'front_end/ui/ViewportControl.js',
             'front_end/ui/ZoomManager.js',
             'front_end/ui/treeoutline.js',
         ],
         'devtools_main_js_files': [
             'front_end/main/accelerometer.css',
             'front_end/main/overrides.css',
             'front_end/main/AdvancedApp.js',
             'front_end/main/HelpScreenUntilReload.js',
             'front_end/main/Main.js',
-            'front_end/main/OverlayController.js',
             'front_end/main/OverridesView.js',
             'front_end/main/RenderingOptions.js',
             'front_end/main/SimpleApp.js',
             'front_end/main/Tests.js',
             'front_end/main/TestController.js',
         ],
         'devtools_module_json_files': [
             'front_end/audits/module.json',
             'front_end/bindings/module.json',
             'front_end/common/module.json',
@@ skipping 414 matching lines @@
             'front_end/Images/thumbVert.png',
             'front_end/Images/toolbarItemSelected.png',
             'front_end/Images/touchCursor.png',
             'front_end/Images/touchCursor_2x.png',
         ],
         'devtools_extension_api_files': [
             'front_end/extensions/ExtensionAPI.js',
         ],
     },
 }