DevTools: allow storing devtools preferences on the browser side. [blink]

Source/devtools/front_end/sources/XHRBreakpointsSidebarPane.js

 // Copyright (c) 2015 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.BreakpointsSidebarPaneBase}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.XHRBreakpointsSidebarPane = function()
 {
     WebInspector.BreakpointsSidebarPaneBase.call(this, WebInspector.UIString("XHR Breakpoints"));
-    this._xhrBreakpointsSetting = WebInspector.settings.createSetting("xhrBreakpoints", []);
+    this._xhrBreakpointsSetting = WebInspector.settings.createLocalSetting("xhrBreakpoints", []);
 
     /** @type {!Map.<string, !Element>} */
     this._breakpointElements = new Map();
 
     var addButton = this.titleElement.createChild("button", "pane-title-button add");
     addButton.title = WebInspector.UIString("Add XHR breakpoint");
     addButton.addEventListener("click", this._addButtonClicked.bind(this), false);
 
     this.emptyElement.addEventListener("contextmenu", this._emptyElementContextMenu.bind(this), true);
 
@@ skipping 226 matching lines @@
         var breakpoints = this._xhrBreakpointsSetting.get();
         for (var i = 0; i < breakpoints.length; ++i) {
             var breakpoint = breakpoints[i];
             if (breakpoint && typeof breakpoint.url === "string")
                 this._setBreakpoint(breakpoint.url, breakpoint.enabled, target);
         }
     },
 
     __proto__: WebInspector.BreakpointsSidebarPaneBase.prototype
 }