DevTools: Make curtain handle dragging work again in Timeline overview

third_party/WebKit/Source/devtools/front_end/ui_lazy/OverviewGrid.js

 /*
  * Copyright (C) 2013 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 @@
     this._enabled = enabled;
   }
 
   /**
    * @param {!Event} event
    */
   _resizerElementStartDragging(event) {
     if (!this._enabled)
       return false;
     this._resizerParentOffsetLeft = event.pageX - event.offsetX - event.target.offsetLeft;
-    event.preventDefault();
+    event.stopPropagation();
     return true;
   }
 
   /**
    * @param {!Event} event
    */
   _leftResizeElementDragging(event) {
     this._resizeWindowLeft(event.pageX - this._resizerParentOffsetLeft);
     event.preventDefault();
   }
@@ skipping 229 matching lines @@
     position = Math.max(0, Math.min(position, this._width));
     if (position < this._startPosition) {
       this._windowSelector.style.left = position + 'px';
       this._windowSelector.style.right = this._width - this._startPosition + 'px';
     } else {
       this._windowSelector.style.left = this._startPosition + 'px';
       this._windowSelector.style.right = this._width - position + 'px';
     }
   }
 };