[Mac] Enable Content-Disposition: attachment sandbox
https://bugs.webkit.org/show_bug.cgi?id=155578
<rdar://problem/
21886326>
Reviewed by Dan Bernstein.
Covered by the existing set of attachment sandbox tests, which have always been run on Mac.
Source/WebKit/mac:
* WebView/WebView.mm:
(-[WebView _commonInitializationWithFrameName:groupName:]):
Source/WebKit2:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::WebPage):
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@198318
268f45cc-cd09-0410-ab3c-
d52691b4dbfc