Modernize the test visited-link-background-color.html
https://bugs.webkit.org/show_bug.cgi?id=111931

Reviewed by Sam Weinig.

Make the test a ref-test instead of a pixel test.

Use Internals' computedStyleIncludingVisitedInfo to make the test reliable
on platforms where the visited link list is updated asynchronously.

* fast/history/visited-link-background-color-expected.html: Copied from LayoutTests/fast/history/visited-link-background-color.html.
* fast/history/visited-link-background-color.html:
* platform/chromium-linux/fast/history/visited-link-background-color-expected.png: Removed.
* platform/chromium-win/fast/history/visited-link-background-color-expected.png: Removed.
* platform/chromium/TestExpectations:
* platform/chromium/fast/history/visited-link-background-color-expected.png: Removed.
* platform/chromium/fast/history/visited-link-background-color-expected.txt: Removed.
* platform/efl-wk1/fast/history/visited-link-background-color-expected.png: Removed.
* platform/efl/fast/history/visited-link-background-color-expected.png: Removed.
* platform/efl/fast/history/visited-link-background-color-expected.txt: Removed.
* platform/gtk/fast/history/visited-link-background-color-expected.png: Removed.
* platform/gtk/fast/history/visited-link-background-color-expected.txt: Removed.
* platform/mac-wk2/fast/history/visited-link-background-color-expected.png: Removed.
* platform/mac-wk2/fast/history/visited-link-background-color-expected.txt: Removed.
* platform/mac/fast/history/visited-link-background-color-expected.png: Removed.
* platform/mac/fast/history/visited-link-background-color-expected.txt: Removed.
* platform/qt/fast/history/visited-link-background-color-expected.png: Removed.
* platform/qt/fast/history/visited-link-background-color-expected.txt: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145408 268f45cc-cd09-0410-ab3c-d52691b4dbfc