DevTools: [CodeMirror] handle new-lines in error popovers

Source/devtools/front_end/source_frame/SourceFrame.js

 /*
  * Copyright (C) 2011 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 761 matching lines @@
  * @param {!WebInspector.ConsoleMessage} consoleMessage
  */
 WebInspector.SourceFrame.RowMessage = function(consoleMessage)
 {
     this._consoleMessage = consoleMessage;
     this._repeatCount = 1;
     this.element = document.createElementWithClass("div", "text-editor-row-message");
     this._icon = this.element.createChild("span", "text-editor-row-message-icon");
     this._icon.classList.add(WebInspector.SourceFrame._iconClassPerLevel[consoleMessage.level]);
     this._repeatCountElement = this.element.createChild("span", "bubble-repeat-count hidden error");
-    this.element.createTextChild(this._consoleMessage.messageText);
+    var linesContainer = this.element.createChild("div", "text-editor-row-message-lines");
+    var lines = this._consoleMessage.messageText.split("\n");
+    for (var i = 0; i < lines.length; ++i) {
+        var messageLine = linesContainer.createChild("div");
+        messageLine.textContent = lines[i];
+    }
 }
 
 WebInspector.SourceFrame.RowMessage.prototype = {
     /**
      * @return {!WebInspector.ConsoleMessage}
      */
     consoleMessage: function()
     {
         return this._consoleMessage;
     },
@@ skipping 221 matching lines @@
 
     /**
      * @param {?WebInspector.TextRange} from
      * @param {?WebInspector.TextRange} to
      */
     onJumpToPosition: function(from, to)
     {
         this._sourceFrame.onJumpToPosition(from, to);
     }
 }