DevTools: remove setScriptFile from UISourceCode.

Source/devtools/front_end/UISourceCode.js

Index: Source/devtools/front_end/UISourceCode.js
diff --git a/Source/devtools/front_end/UISourceCode.js b/Source/devtools/front_end/UISourceCode.js
index a03fbd63bd92a6c3e882dbd1934fb4743d4c8745..37feaab50889c0660c7725ba5e92438151cb3224 100644
--- a/Source/devtools/front_end/UISourceCode.js
+++ b/Source/devtools/front_end/UISourceCode.js
@@ -220,15 +220,11 @@ WebInspector.UISourceCode.prototype = {
      */
     scriptFile: function()
     {
-        return this._scriptFile;
-    },
-
-    /**
-     * @param {?WebInspector.ScriptFile} scriptFile
-     */
-    setScriptFile: function(scriptFile)
-    {
-        this._scriptFile = scriptFile;
+        if (this._sourceMapping instanceof WebInspector.SourceMappingWithScriptFile) {
+            var mapping = /** @type {!WebInspector.SourceMappingWithScriptFile} */ (this._sourceMapping);
+            return mapping.scriptFile(this);
+        }
+        return null;
     },
 
     /**