<https://webkit.org/b/119944> The fast/dom/gc-10.html layout test should dump text instead of render tree

Reviewed by Darin Adler.

The fast/dom/gc-10.html layout test is unnecessarily dumping the render tree and the pixel output.
Dumping the text output is sufficient enough for this test.

* fast/dom/gc-10-expected.txt: Added.
* fast/dom/gc-10.html:
* platform/efl/fast/dom/gc-10-expected.png: Removed.
* platform/efl/fast/dom/gc-10-expected.txt: Removed.
* platform/gtk/fast/dom/gc-10-expected.txt: Removed.
* platform/mac/fast/dom/gc-10-expected.png: Removed.
* platform/mac/fast/dom/gc-10-expected.txt: Removed.
* platform/qt-5.0-wk2/fast/dom/gc-10-expected.png: Removed.
* platform/qt/fast/dom/gc-10-expected.png: Removed.
* platform/qt/fast/dom/gc-10-expected.txt: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154236 268f45cc-cd09-0410-ab3c-d52691b4dbfc