DevTools: promisify ContentProvider.requestContent and all its clients.

third_party/WebKit/Source/devtools/front_end/sources/JavaScriptBreakpointsSidebarPane.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.SidebarPane}
  * @param {!WebInspector.BreakpointManager} breakpointManager
  * @param {function(!WebInspector.UISourceCode, number=, number=, boolean=)} showSourceLineDelegate
  */
@@ skipping 81 matching lines @@
             var contentString = new String(content);
             if (lineNumber < contentString.lineCount()) {
                 var lineText = contentString.lineAt(lineNumber);
                 var maxSnippetLength = 200;
                 var snippetStartIndex = columnNumber > 100 ? columnNumber : 0;
                 snippetElement.textContent = lineText.substr(snippetStartIndex).trimEnd(maxSnippetLength);
             }
             this.didReceiveBreakpointLineForTest(uiLocation.uiSourceCode);
         }
 
-        uiLocation.uiSourceCode.requestContent(didRequestContent.bind(this));
+        uiLocation.uiSourceCode.requestContent().then(didRequestContent.bind(this));
 
         element._data = uiLocation;
         var currentElement = this.listElement.firstChild;
         while (currentElement) {
             if (currentElement._data && this._compareBreakpoints(currentElement._data, element._data) > 0)
                 break;
             currentElement = currentElement.nextSibling;
         }
         this._addListElement(element, currentElement);
 
@@ skipping 138 matching lines @@
         this.listElement.removeChildren();
         if (this.listElement.parentElement) {
             this.element.removeChild(this.listElement);
             this.element.appendChild(this.emptyElement);
         }
         this._items.clear();
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }