Remove TOUCH_START event handler from volume_list.js

I've just checked and found it's unnecessary. Touching comes with click events?

BUG=none
TEST=manual
R=mtomasz@chromium.org

Review URL: https://codereview.chromium.org/22384002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215853 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/file_manager/js/volume_list.js

@@ -311,9 +311,6 @@ VolumeList.prototype.renderRoot_ = function(path) {
     unmountCommand.execute(item);
   };
   item.addEventListener('eject', handleEject);
-  // TODO(yoshiki): Check if the following touch handler is necessary or not.
-  // If unnecessary, remove it.
-  item.addEventListener(cr.ui.TouchHandler.EventType.TOUCH_START, handleClick);
 
   if (this.contextMenu_)
     item.maybeSetContextMenu(this.contextMenu_);