Remove unused functions in GraphicsContext3D.cpp
https://bugs.webkit.org/show_bug.cgi?id=126265

Reviewed by Andreas Kling.

platformGraphicsContext3D, platformTexture and platformLayer in GC3D.cpp
seem not used by any ports.

No new tests, no functionality changed.

* platform/graphics/GraphicsContext3D.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161136 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reverted r156742. The same fix was reverted from Blink due to heap-use-after-free on ClusterFuzz.
https://bugs.webkit.org/show_bug.cgi?id=126275

https://codereview.chromium.org/102993011

Reviewed by Darin Adler.

Source/WebCore:

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::updateFirstLetter):

LayoutTests:

* fast/css/first-letter-block-change.html: Removed.
* platform/gtk-wk1/fast/css/first-letter-block-change-expected.png: Removed.
* platform/gtk-wk2/fast/css/first-letter-block-change-expected.png: Removed.
* platform/gtk/fast/css/first-letter-block-change-expected.txt: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161137 268f45cc-cd09-0410-ab3c-d52691b4dbfc