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

Source/devtools/front_end/ScriptSnippetModel.js

Index: Source/devtools/front_end/ScriptSnippetModel.js
diff --git a/Source/devtools/front_end/ScriptSnippetModel.js b/Source/devtools/front_end/ScriptSnippetModel.js
index 57908e119b7bee2c3609bfa04ac513ce4d0ffe27..28f2325ab1789b62e2f134bea088ed7da1c707ac 100644
--- a/Source/devtools/front_end/ScriptSnippetModel.js
+++ b/Source/devtools/front_end/ScriptSnippetModel.js
@@ -189,7 +189,7 @@ WebInspector.ScriptSnippetModel.prototype = {
         // 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;
         }