DevTools: promisify ContentProvider.requestContent and all its clients.

third_party/WebKit/Source/devtools/front_end/bindings/StylesSourceMapping.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 292 matching lines @@
 
         var header = this._cssModel.styleSheetHeaderForId(styleSheetId);
         if (!header)
             return;
         var styleSheetURL = header.resourceURL();
         if (!styleSheetURL)
             return;
         var uiSourceCode = this._networkMapping.uiSourceCodeForStyleURL(styleSheetURL, header);
         if (!uiSourceCode)
             return;
-        header.requestContent(callback.bind(this, uiSourceCode));
+        header.requestContent().then(callback.bind(this, uiSourceCode));
 
         /**
          * @param {!WebInspector.UISourceCode} uiSourceCode
          * @param {?string} content
          * @this {WebInspector.StylesSourceMapping}
          */
         function callback(uiSourceCode, content)
         {
             var styleFile = this._styleFiles.get(uiSourceCode);
             if (styleFile)
@@ skipping 69 matching lines @@
         this._uiSourceCode.addRevision(content);
         delete this._isAddingRevision;
     },
 
     dispose: function()
     {
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._workingCopyCommitted, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._workingCopyChanged, this);
     }
 }