DevTools: get rid of the global capabilities set.

Source/devtools/front_end/timeline/TimelinePowerOverview.js

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @extends {WebInspector.Object}
  */
 WebInspector.TimelinePowerOverviewDataProvider = function()
 {
@@ skipping 90 matching lines @@
 }
 
 WebInspector.TimelinePowerOverview.prototype = {
     dispose: function()
     {
         this._dataProvider.dispose();
     },
 
     timelineStarted: function()
     {
-        if (Capabilities.canProfilePower)
+        if (WebInspector.targetManager.activeTarget().hasCapability(WebInspector.Target.Capabilities.canProfilePower))
             WebInspector.powerProfiler.startProfile();
     },
 
     timelineStopped: function()
     {
-        if (Capabilities.canProfilePower)
+        if (WebInspector.targetManager.activeTarget().hasCapability(WebInspector.Target.Capabilities.canProfilePower))
             WebInspector.powerProfiler.stopProfile();
     },
 
     _resetPowerLabels: function()
     {
         this._maxPowerLabel.textContent = "";
         this._minPowerLabel.textContent = "";
     },
 
     update: function()
@@ skipping 80 matching lines @@
      */
     calculateEnergy: function(minTime, maxTime)
     {
         return this._dataProvider._calculateEnergy(minTime, maxTime);
     },
 
     __proto__: WebInspector.TimelineOverviewBase.prototype
 }