Fix TestingAutomationProvider::SimulateAsanMemoryBug.

Fix TestingAutomationProvider::SimulateAsanMemoryBug.

1) Return before cause a crash.
2) Add `volatile` so that the compiler does not optimize us out.

FYI, The test initially added here:
https://gerrit.chromium.org/gerrit/#change,23212

BUG=chromium:126774
TEST=./run_remote_tests.sh client/site_tests/logging_AsanCrash

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=138463

[glotov, 2012-05-22 14:34:09]

Hi! Just a two lines change. Please have a look.

[Nirnimesh, 2012-05-22 16:29:43]

http://codereview.chromium.org/10417031/diff/1/chrome/browser/automation/test...
File chrome/browser/automation/testing_automation_provider.cc (right):

http://codereview.chromium.org/10417031/diff/1/chrome/browser/automation/test...
chrome/browser/automation/testing_automation_provider.cc:5894: volatile int
testarray[41];
please make a note here why it's volatile.

http://codereview.chromium.org/10417031/diff/1/chrome/browser/automation/test...
chrome/browser/automation/testing_automation_provider.cc:5895:
AutomationJSONReply(this, reply_message).SendSuccess(NULL);
Most pyauto automation hooks return _after_ they've done their job. Since this
is not in that league, please make a note of this in SimulateAsanMemoryBug's
docstring in pyauto.py. Something like:
This returns immediately before it actually causes a crash.

[glotov, 2012-05-22 16:38:53]

All done, please have another look.

[Nirnimesh, 2012-05-22 16:43:24]

LGTM

http://codereview.chromium.org/10417031/diff/5001/chrome/test/pyautolib/pyaut...
File chrome/test/pyautolib/pyauto.py (right):

http://codereview.chromium.org/10417031/diff/5001/chrome/test/pyautolib/pyaut...
chrome/test/pyautolib/pyauto.py:4034: This API returns immediately before it
actually causes a crash.
API -> method