Fix some async repaint tests

Fix some async repaint tests

Some async layout tests use waitUntilDone() and notifyDone() by
themselves, without setting window.testIsAsync to true.

This may be either unnecessary or incorrect, depending on which of the
test's notifyDone() and text-based-repaint.js's notifyDone() executes
first. If the latter executes first, the test may finish before it's
done causing what the test want to test not fully executed.

BUG=381242
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175599

[Xianzhu, 2014-06-05 18:09:01]

https://codereview.chromium.org/316193003/diff/1/LayoutTests/fast/repaint/crb...
File LayoutTests/fast/repaint/crbug-371640.html (left):

https://codereview.chromium.org/316193003/diff/1/LayoutTests/fast/repaint/crb...
LayoutTests/fast/repaint/crbug-371640.html:14: testRunner.notifyDone();
This is unnecessary, because the repaint rects has already collected in
finishRepaintTest() (as window.testIsAsync is false). The above delay just
delays the finish of test but doesn't affect the result.

[enne (OOO), 2014-06-05 20:34:41]

lgtm.  This is great!  Thanks for cleaning all this up.

[Xianzhu, 2014-06-05 20:51:00]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2014-06-05 20:52:07]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wangxianzhu@chromium.org/316193003/1

[Xianzhu, 2014-06-05 22:00:26]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2014-06-05 22:00:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wangxianzhu@chromium.org/316193003/20001

[commit-bot: I haz the power, 2014-06-05 23:53:08]

Change committed as 175599