Fix incorrect tooltip displayed for dock icon in "Dev Tools".

Source/devtools/front_end/components/DockController.js

 /*
  * Copyright (C) 2012 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 51 matching lines @@
     AfterDockSideChanged: "AfterDockSideChanged"
 }
 
 WebInspector.DockController.prototype = {
     initialize: function()
     {
         if (!this._canDock)
             return;
 
         this._states = [WebInspector.DockController.State.DockedToRight, WebInspector.DockController.State.DockedToBottom, WebInspector.DockController.State.Undocked];
-        this._titles = [WebInspector.UIString("Dock to main window."), WebInspector.UIString("Undock into separate window."), WebInspector.UIString("Dock to main window.")];
+        this._titles = [WebInspector.UIString("Dock to main window."), WebInspector.UIString("Dock to main window."), WebInspector.UIString("Undock into separate window.")];
         if (Runtime.experiments.isEnabled("dockToLeft")) {
             this._states.push(WebInspector.DockController.State.DockedToLeft);
             this._titles.push(WebInspector.UIString("Dock to main window."));
         }
         var initialState = WebInspector.settings.currentDockState.get();
         initialState = this._states.indexOf(initialState) >= 0 ? initialState : this._states[0];
         this._dockSideChanged(initialState);
     },
 
     /**
@@ skipping 107 matching lines @@
                     WebInspector.dockController._dockSideChanged.bind(WebInspector.dockController));
         }
         return this._dockToggleButton;
     }
 }
 
 /**
  * @type {!WebInspector.DockController}
  */
 WebInspector.dockController;