XSSAuditor: Dont give a pass to subsequent script blocks if first one is empty.

XSSAuditor: Dont give a pass to subsequent script blocks if first one is empty.

Script bodies are filtered in chunks with the earliest chunk controlling
the suppression of subsequent ones.  But we may fail to match if the first
chunk can be reduced to an empty string.  Keep looking in that case.

BUG=500877
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197282

[Tom Sepez, 2015-06-16 18:21:38]

tsepez@chromium.org changed reviewers:
+ mkwst@chromium.org

[Tom Sepez, 2015-06-16 18:21:55]

Mike, for review.  Legitimate bypass.

[Mike West, 2015-06-17 08:49:42]

Makes sense to me, thanks for adding the test. LGTM.

[Tom Sepez, 2015-06-17 17:37:32]

The CQ bit was checked by tsepez@chromium.org

[commit-bot: I haz the power, 2015-06-17 17:38:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1187843005/1

[commit-bot: I haz the power, 2015-06-17 18:20:51]

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

[commit-bot: I haz the power, 2015-06-17 18:20:52]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/67057)

[Tom Sepez, 2015-06-17 19:18:47]

The CQ bit was checked by tsepez@chromium.org

[commit-bot: I haz the power, 2015-06-17 19:19:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1187843005/1

[commit-bot: I haz the power, 2015-06-17 21:30:25]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197282