Make sure the --site-per-process flag is present for subframe process swaps.

Make sure the --site-per-process flag is present for subframe process swaps.

(Attempt #2, after a speculative revert from a flaky test.)

BUG=461494
TEST=Crash report should show that --site-per-process flag is present.

Committed: https://crrev.com/a741b8a36ac9eecf6bad6a324fcfc66a35a521cb
Cr-Commit-Position: refs/heads/master@{#318798}

[Charlie Reis, 2015-03-02 22:28:38]

creis@chromium.org changed reviewers:
+ alexmos@chromium.org

[Charlie Reis, 2015-03-02 22:28:38]

Alex: Perhaps we should try again?  I don't see how this could cause the Asan
failures, since this code isn't invoked in that test.

[alexmos, 2015-03-02 22:34:37]

LGTM.  Hope it sticks this time.

[Charlie Reis, 2015-03-02 22:48:40]

The CQ bit was checked by creis@chromium.org

[commit-bot: I haz the power, 2015-03-02 22:52:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/972773003/1

[commit-bot: I haz the power, 2015-03-02 23:42:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-02 23:43:30]

Patchset 1 (id:??) landed as
https://crrev.com/a741b8a36ac9eecf6bad6a324fcfc66a35a521cb
Cr-Commit-Position: refs/heads/master@{#318798}