Eliminate globalFlag usage from http security layout tests.

Eliminate globalFlag usage from http security layout tests.

Tests that polled globalFlag were using it as a way to figure out when
another subframe had loaded. Instead of using globalFlag, those tests
have been rewritten to use a combination of the window load event (which
waits for all subframes to finish loading before firing), the iframe
load event (which also waits for all subframes), and postMessage when
a subframe can only start running its tests after the entire page is
loaded.

BUG=405846
R=tsepez@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180782

[Tom Sepez, 2014-08-22 16:32:31]

LGTM! Thanks for the cleanup.

[dcheng, 2014-08-22 16:37:50]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-08-22 16:38:17]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dcheng@chromium.org/494343003/20001

[commit-bot: I haz the power, 2014-08-22 16:43:09]

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

[commit-bot: I haz the power, 2014-08-22 16:45:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-22 16:45:51]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/android_chromium_gn_comp...)

[dcheng, 2014-08-22 16:50:49]

Committed patchset #2 manually as 180782 (presubmit successful).