Revert of DevTools: Remove pageAgent() call from DebuggerModel

Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 201 matching lines @@
         WebInspector.networkMapping = new WebInspector.NetworkMapping(WebInspector.workspace, WebInspector.isolatedFileSystemManager.mapping());
         WebInspector.networkProject = new WebInspector.NetworkProject(WebInspector.workspace, WebInspector.networkMapping);
         WebInspector.presentationConsoleMessageHelper = new WebInspector.PresentationConsoleMessageHelper(WebInspector.workspace);
         WebInspector.cssWorkspaceBinding = new WebInspector.CSSWorkspaceBinding(WebInspector.workspace, WebInspector.networkMapping, WebInspector.networkProject);
         WebInspector.debuggerWorkspaceBinding = new WebInspector.DebuggerWorkspaceBinding(WebInspector.targetManager, WebInspector.workspace, WebInspector.networkMapping, WebInspector.networkProject);
         WebInspector.fileSystemWorkspaceBinding = new WebInspector.FileSystemWorkspaceBinding(WebInspector.isolatedFileSystemManager, WebInspector.workspace, WebInspector.networkMapping);
         WebInspector.breakpointManager = new WebInspector.BreakpointManager(WebInspector.settings.breakpoints, WebInspector.workspace, WebInspector.networkMapping, WebInspector.targetManager, WebInspector.debuggerWorkspaceBinding);
         WebInspector.scriptSnippetModel = new WebInspector.ScriptSnippetModel(WebInspector.workspace);
         WebInspector.extensionServer = new WebInspector.ExtensionServer();
 
-        new WebInspector.OverlayController();
         new WebInspector.ContentScriptProjectDecorator();
         new WebInspector.ExecutionContextSelector();
 
         var autoselectPanel = WebInspector.UIString("a panel chosen automatically");
         var openAnchorLocationSetting = WebInspector.settings.createSetting("openLinkHandler", autoselectPanel);
         WebInspector.openAnchorLocationRegistry = new WebInspector.HandlerRegistry(openAnchorLocationSetting);
         WebInspector.openAnchorLocationRegistry.registerHandler(autoselectPanel, function() { return false; });
         WebInspector.Linkifier.setLinkHandler(new WebInspector.HandlerRegistry.LinkHandler());
 
         new WebInspector.WorkspaceController(WebInspector.workspace);
@@ skipping 709 matching lines @@
     p.classList.add("help-section");
     p.textContent = WebInspector.UIString("Inspected worker has terminated. Once it restarts we will attach to it automatically.");
 }
 
 WebInspector.WorkerTerminatedScreen.prototype = {
 
     __proto__: WebInspector.HelpScreen.prototype
 }
 
 new WebInspector.Main();