DevTools: Get rid of synchronous XHRs in the frontend code

Source/devtools/front_end/bindings/TempFile.js

Index: Source/devtools/front_end/bindings/TempFile.js
diff --git a/Source/devtools/front_end/bindings/TempFile.js b/Source/devtools/front_end/bindings/TempFile.js
index a9674a87f2ae9005f86aae2d7f3ea849e5940e1c..9aedcd93d7b0077e192cb78bf14e244b48e55106 100644
--- a/Source/devtools/front_end/bindings/TempFile.js
+++ b/Source/devtools/front_end/bindings/TempFile.js
@@ -32,9 +32,9 @@ window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileS
 
 /**
  * @constructor
- * @param {!string} dirPath
- * @param {!string} name
- * @param {!function(?WebInspector.TempFile)} callback
+ * @param {string} dirPath
+ * @param {string} name
+ * @param {function(?WebInspector.TempFile)} callback
  */
 WebInspector.TempFile = function(dirPath, name, callback)
 {
@@ -121,7 +121,7 @@ WebInspector.TempFile = function(dirPath, name, callback)
 WebInspector.TempFile.prototype = {
     /**
      * @param {!Array.<string>} strings
-     * @param {!function(boolean)} callback
+     * @param {function(boolean)} callback
      */
     write: function(strings, callback)
     {
@@ -221,8 +221,8 @@ WebInspector.TempFile.prototype = {
 
 /**
  * @constructor
- * @param {!string} dirPath
- * @param {!string} name
+ * @param {string} dirPath
+ * @param {string} name
  */
 WebInspector.DeferredTempFile = function(dirPath, name)
 {
@@ -252,7 +252,7 @@ WebInspector.DeferredTempFile.prototype = {
     },
 
     /**
-     * @param {!function(?WebInspector.TempFile)} callback
+     * @param {function(?WebInspector.TempFile)} callback
      */
     finishWriting: function(callback)
     {
@@ -363,16 +363,24 @@ WebInspector.DeferredTempFile.prototype = {
  */
 WebInspector.TempStorageCleaner = function()
 {
-    this._worker = Runtime.startSharedWorker("temp_storage_shared_worker", "TempStorage");
-    this._worker.onerror = this._handleError.bind(this);
-    this._callbacks = [];
-    this._worker.port.onmessage = this._handleMessage.bind(this);
-    this._worker.port.onerror = this._handleError.bind(this);
+    Runtime.startSharedWorker("temp_storage_shared_worker", "TempStorage").then(this._init.bind(this)).done();
 }
 
 WebInspector.TempStorageCleaner.prototype = {
     /**
-     * @param {!function()} callback
+     * @param {!SharedWorker} worker
+     */
+    _init: function(worker)
+    {
+        this._worker = worker;
+        this._worker.onerror = this._handleError.bind(this);
+        this._callbacks = [];
+        this._worker.port.onmessage = this._handleMessage.bind(this);
+        this._worker.port.onerror = this._handleError.bind(this);
+    },
+
+    /**
+     * @param {function()} callback
      */
     ensureStorageCleared: function(callback)
     {
@@ -407,7 +415,7 @@ WebInspector.TempStorageCleaner.prototype = {
 }
 
 /**
- * @param {!function()} callback
+ * @param {function()} callback
  */
 WebInspector.TempFile._ensureTempStorageCleared = function(callback)
 {