Remove support for Chromium from api-test
https://bugs.webkit.org/show_bug.cgi?id=115211

Patch by Seokju Kwon <seokju.kwon@gmail.com> on 2013-04-25
Reviewed by Dirk Pranke.

* Scripts/build-api-tests:
* Scripts/run-api-tests:
(isSupportedPlatform):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149164 268f45cc-cd09-0410-ab3c-d52691b4dbfc