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

LayoutTests/http/tests/inspector/inspector-test.js

 var initialize_InspectorTest = function() {
 
 var results = [];
 
 function consoleOutputHook(messageType)
 {
     InspectorTest.addResult(messageType + ": " + Array.prototype.slice.call(arguments, 1));
 }
 
 window._originalConsoleLog = console.log.bind(console);
@@ skipping 844 matching lines @@
 
         var promises = [];
         for (var moduleName of InspectorTest._modulesToPreload)
             promises.push(self.runtime.loadModulePromise(moduleName));
 
         for (var i = 0; i < InspectorTest._panelsToPreload.length; ++i) {
             lastLoadedPanel = InspectorTest._panelsToPreload[i];
             promises.push(WebInspector.inspectorView.panel(lastLoadedPanel));
         }
 
-        var testPath = self.localStorage ? self.localStorage["testPath"] || "" : "";
+        var testPath = WebInspector.settings.createSetting("testPath", "").get();
 
         // 2. Show initial panel based on test path.
         var initialPanelByFolder = {
             "audits": "audits",
             "console": "console",
             "elements": "elements",
             "editor": "sources",
             "layers": "layers",
             "profiler": "profiles",
             "resource-tree": "resources",
@@ skipping 98 matching lines @@
     _output("[page] " + text);
 }
 
 function _output(result)
 {
     if (!outputElement)
         createOutputElement();
     outputElement.appendChild(document.createTextNode(result));
     outputElement.appendChild(document.createElement("br"));
 }