https://bugs.webkit.org/show_bug.cgi?id=71721

Reviewed by Eric Seidel.

The new SecurityContext object lets us tightly scope control of
the security-critical information in ScriptExecutionContext.
Originally I had hoped to put all this state on SecurityOrigin, but
SecurityOrigin gets shared between documents in some corner cases, so
it's not a good fit for state like the sandbox flags and the CSP policy
that really needs to be per-document.

* CMakeLists.txt:
* GNUmakefile.list.am:
* Target.pri:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:
* dom/DOMAllInOne.cpp:
* dom/ScriptExecutionContext.cpp:
(WebCore::ScriptExecutionContext::ScriptExecutionContext):
* dom/ScriptExecutionContext.h:
* loader/FrameLoader.h:
* loader/FrameLoaderTypes.h:
* page/SecurityOrigin.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@99464 268f45cc-cd09-0410-ab3c-d52691b4dbfc