DevTools: Reuse _showSourceLocation for execution line changes handling in sources panel

Source/devtools/front_end/CodeMirrorTextEditor.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 741 matching lines @@
             if (classes[i].startsWith("cm-breakpoint"))
                 this._codeMirror.removeLineClass(lineNumber, "wrap", classes[i]);
         }
     },
 
     /**
      * @param {number} lineNumber
      */
     setExecutionLine: function(lineNumber)
     {
+        this.clearPositionHighlight();
         this._executionLine = this._codeMirror.getLineHandle(lineNumber);
+        if (!this._executionLine)
+            return;
         this._codeMirror.addLineClass(this._executionLine, "wrap", "cm-execution-line");
     },
 
     clearExecutionLine: function()
     {
+        this.clearPositionHighlight();
         if (this._executionLine)
             this._codeMirror.removeLineClass(this._executionLine, "wrap", "cm-execution-line");
         delete this._executionLine;
     },
 
     /**
      * @param {number} lineNumber
      * @param {!Element} element
      */
     addDecoration: function(lineNumber, element)
@@ skipping 36 matching lines @@
         }
         this.setSelection(WebInspector.TextRange.createFromLocation(lineNumber, columnNumber));
     },
 
     clearPositionHighlight: function()
     {
         if (this._clearHighlightTimeout)
             clearTimeout(this._clearHighlightTimeout);
         delete this._clearHighlightTimeout;
 
-         if (this._highlightedLine)
+        if (this._highlightedLine)
             this._codeMirror.removeLineClass(this._highlightedLine, null, "cm-highlight");
         delete this._highlightedLine;
     },
 
     /**
      * @return {!Array.<!Element>}
      */
     elementsToRestoreScrollPositionsFor: function()
     {
         return [];
@@ skipping 884 matching lines @@
     var backgroundColorRule = backgroundColor ? ".CodeMirror .CodeMirror-selected { background-color: " + backgroundColor + ";}" : "";
     var foregroundColor = InspectorFrontendHost.getSelectionForegroundColor();
     var foregroundColorRule = foregroundColor ? ".CodeMirror .CodeMirror-selectedtext:not(.CodeMirror-persist-highlight) { color: " + foregroundColor + "!important;}" : "";
     if (!foregroundColorRule && !backgroundColorRule)
         return;
 
     var style = document.createElement("style");
     style.textContent = backgroundColorRule + foregroundColorRule;
     document.head.appendChild(style);
 })();