[DevTools] Move device mode button to AdvancedApp and add shortcut.

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 474 matching lines @@
 
         keys = [
             shortcut.makeDescriptor("[", shortcut.Modifiers.CtrlOrMeta | shortcut.Modifiers.Alt),
             shortcut.makeDescriptor("]", shortcut.Modifiers.CtrlOrMeta | shortcut.Modifiers.Alt)
         ];
         section.addRelatedKeys(keys, WebInspector.UIString("Go back/forward in panel history"));
 
         var toggleConsoleLabel = WebInspector.UIString("Show console");
         section.addKey(shortcut.makeDescriptor(shortcut.Keys.Tilde, shortcut.Modifiers.Ctrl), toggleConsoleLabel);
         section.addKey(shortcut.makeDescriptor(shortcut.Keys.Esc), WebInspector.UIString("Toggle drawer"));
+        if (WebInspector.overridesSupport.responsiveDesignAvailable())
+            section.addKey(shortcut.makeDescriptor("M", shortcut.Modifiers.CtrlOrMeta | shortcut.Modifiers.Shift), WebInspector.UIString("Toggle device mode"));
         section.addKey(shortcut.makeDescriptor("f", shortcut.Modifiers.CtrlOrMeta), WebInspector.UIString("Search"));
 
         var advancedSearchShortcutModifier = WebInspector.isMac()
                 ? WebInspector.KeyboardShortcut.Modifiers.Meta | WebInspector.KeyboardShortcut.Modifiers.Alt
                 : WebInspector.KeyboardShortcut.Modifiers.Ctrl | WebInspector.KeyboardShortcut.Modifiers.Shift;
         var advancedSearchShortcut = shortcut.makeDescriptor("f", advancedSearchShortcutModifier);
         section.addKey(advancedSearchShortcut, WebInspector.UIString("Search across all sources"));
 
         var inspectElementModeShortcut = WebInspector.InspectElementModeController.createShortcut();
         section.addKey(inspectElementModeShortcut, WebInspector.UIString("Select node to inspect"));
@@ skipping 378 matching lines @@
 
 WebInspector.Main.InspectedNodeRevealer.prototype = {
     /**
      * @param {!WebInspector.Event} event
      */
     _inspectNode: function(event)
     {
         WebInspector.Revealer.reveal(/** @type {!WebInspector.DOMNode} */ (event.data));
     }
 }