Convert some fast/regions pixel tests to reftests

Convert some fast/regions pixel tests to reftests
https://bugs.webkit.org/show_bug.cgi?id=78906

Patch by Flex Mobile <rhauck@adobe.com> on 2012-02-24
Reviewed by Hajime Morita.

* fast/regions/float-pushed-width-change-expected.html: Added.
* fast/regions/float-pushed-width-change.html:
* platform/chromium/test_expectations.txt:
* platform/efl/fast/regions/float-pushed-width-change-expected.png: Removed.
* platform/efl/fast/regions/float-pushed-width-change-expected.txt: Removed.
* platform/mac/fast/regions/float-pushed-width-change-expected.png: Removed.
* platform/mac/fast/regions/float-pushed-width-change-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108766 268f45cc-cd09-0410-ab3c-d52691b4dbfc