Remove TestExpectations for some no-longer-flaky fullscreen tests

Remove TestExpectations for some no-longer-flaky fullscreen tests

None of these appear to have any recent failures in the flakiness dashboard:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=full-screen-remove-ancestor.html
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=full-screen-iframe-allowed.html

To verify, the affected tests were run with --iterations=1000 on Linux
Debug/Release and Mac Debug builds with no failures or timeouts.

BUG=100798
BUG=243782
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179592

[philipj_slow, 2014-08-05 21:52:02]

PTAL

[falken, 2014-08-06 04:19:43]

On 2014/08/05 21:52:02, philipj wrote:
> PTAL

Awesome! lgtm

[philipj_slow, 2014-08-06 08:11:33]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-08-06 08:13:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/philipj@opera.com/448463002/1

[commit-bot: I haz the power, 2014-08-06 09:13:24]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[commit-bot: I haz the power, 2014-08-06 09:27:59]

Change committed as 179592