[Internals] Should be able to access corresponding Document object.

[Internals] Should be able to access corresponding Document object.
https://bugs.webkit.org/show_bug.cgi?id=76425

.:

Added exported symbols.

Patch by Hajime Morrita <morrita@chromium.org> on 2012-01-17
Reviewed by Adam Barth.

* Source/autotools/symbols.filter:

Source/WebCore:

Patch by Hajime Morrita <morrita@chromium.org> on 2012-01-17
Reviewed by Adam Barth.

- Allow FrameDestructionObserver to re-setting the Frame reference.
- Make Internals a subclass of FrameDestructionObserver.

Since Internals::reset() is called for each test, we can access
the acive Frame object during the test. The frame reference will be
used by coming changes.

No new tests. Covered by existing tests.

* WebCore.exp.in:
* page/FrameDestructionObserver.cpp:
(WebCore::FrameDestructionObserver::FrameDestructionObserver):
(WebCore::FrameDestructionObserver::~FrameDestructionObserver):
(WebCore::FrameDestructionObserver::observe):
* page/FrameDestructionObserver.h:
* testing/Internals.cpp:
(WebCore::Internals::Internals):
(WebCore::Internals::reset):
* testing/Internals.h:

Source/WebKit2:

Patch by Hajime Morrita <morrita@chromium.org> on 2012-01-17
Reviewed by Adam Barth.

* win/WebKit2.def: Added exporting symbols.
* win/WebKit2CFLite.def: Added exporting symbols.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105245 268f45cc-cd09-0410-ab3c-d52691b4dbfc