View-source iframes are dangerous (and not very useful).
https://bugs.webkit.org/show_bug.cgi?id=113345

Reviewed by Adam Barth.

Source/WebCore:

* html/HTMLFrameElementBase.cpp:
(WebCore::HTMLFrameElementBase::parseAttribute):
Conditionalize viewsource attribute on ENABLE(VIEWSOURCE_ATTRIBUTE).

Source/WebKit/chromium:

* features.gypi:
Disable VIEWSOURCE_ATTRIBUTE for chromium.

Source/WTF:

* wtf/FeatureDefines.h:
Default definition of ENABLE_VIEWSOURCE_ATTRIBUTE is enabled.

LayoutTests:

* platform/chromium/TestExpectations:
Update expectations now that chromium excludes iframe's viewsource attribute.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147280 268f45cc-cd09-0410-ab3c-d52691b4dbfc