Summary:
we use to only add X-Frame-Options for AphrontWebpageResponse.
There some security concern about it. Example of a drag-drop attack:
http://sites.google.com/site/tentacoloviola/. The fix is to add it to
all AphrontResponse.
Test Plan:
View page which disalble this option still works (like the
xhpast tree page); verify that the AphrontAjaxResponse contains the
X-Frame-Options in the header.
Reviewers: epriestley, benmathews
Reviewed By: epriestley
CC: nh, aran, jungejason, epriestley
Differential Revision: 926
