DevTools: Add support for //# sourceURL (sourceMappingURL) comments and deprecate //@ ones

Source/devtools/front_end/ScriptSnippetModel.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 171 matching lines @@
         uiSourceCode._evaluationIndex = evaluationIndex;
         var evaluationUrl = this._evaluationSourceURL(uiSourceCode);
 
         var expression = uiSourceCode.workingCopy();
         
         // In order to stop on the breakpoints during the snippet evaluation we need to compile and run it separately.
         // If separate compilation and execution is not supported by the port we fall back to evaluation in console.
         // In case we don't need that since debugger is already paused.
         // We do the same when we are stopped on the call frame  since debugger is already paused and can not stop on breakpoint anymore.
         if (WebInspector.debuggerModel.selectedCallFrame()) {
-            expression = uiSourceCode.workingCopy() + "\n//@ sourceURL=" + evaluationUrl + "\n";
+            expression = uiSourceCode.workingCopy() + "\n//# sourceURL=" + evaluationUrl + "\n";
             WebInspector.evaluateInConsole(expression, true);
             return;
         }
         
         WebInspector.showConsole();
         DebuggerAgent.compileScript(expression, evaluationUrl, compileCallback.bind(this));
 
         /**
          * @param {?string} error
          * @param {string=} scriptId
@@ skipping 435 matching lines @@
         this._model.renameScriptSnippet(path[0], newName, callback);
     },
 
     __proto__: WebInspector.ContentProviderBasedProjectDelegate.prototype
 }
 
 /**
  * @type {?WebInspector.ScriptSnippetModel}
  */
 WebInspector.scriptSnippetModel = null;