https://bugs.webkit.org/show_bug.cgi?id=116532

Reviewed by Anders Carlsson.

Source/WebCore:

In http://trac.webkit.org/changeset/149326 we relaxed our policy for
localStorage when third-party data blocking is enabled to create a
transient, session-scoped storage area for the third-party origin
instead of throwing an exception. Since this gives essentially the same
behavior as sessionStorage, we might as well also allow sessionStorage
for third-party origins.

Test: http/tests/security/cross-origin-session-storage-third-party-blocked.html

* WebCore.exp.in: Updated the symbol for
SecurityOrigin::canAccessStorage.
* page/DOMWindow.cpp:
(WebCore::DOMWindow::sessionStorage): Called canAccessSessionStorage()
rather than canAccessLocalStorage().
* page/SecurityOrigin.cpp:
(WebCore::SecurityOrigin::canAccessStorage): Passed in an enum
indicating if access should be allowed from third-party origins.
* page/SecurityOrigin.h:
(WebCore::SecurityOrigin::canAccessSessionStorage): Called
canAccessStorage() with AlwaysAllowFromThirdParty.
(SecurityOrigin):

LayoutTests:

* http/tests/security/cross-origin-session-storage-third-party-blocked-expected.txt: Renamed from LayoutTests/http/tests/security/cross-origin-session-storage-expected.txt.
* http/tests/security/cross-origin-session-storage-third-party-blocked.html: Renamed from LayoutTests/http/tests/security/cross-origin-session-storage.html.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150490 268f45cc-cd09-0410-ab3c-d52691b4dbfc