Disable ToolbarButtonDragTest.DragActivation

BUG=325055
TBR=gbillock

Review URL: https://codereview.chromium.org/101123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238311 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238311