[test] Shorten excessive webkit test.

[test] Shorten excessive webkit test.

BUG=

Committed: https://crrev.com/d4d5663a2f432a97721a15044f118154a287a1ed
Cr-Commit-Position: refs/heads/master@{#29895}

[Michael Achenbach, 2015-07-27 21:00:16]

The CQ bit was checked by machenbach@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-07-27 21:00:27]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1257583005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1257583005/1

[Michael Achenbach, 2015-07-27 21:20:24]

machenbach@chromium.org changed reviewers:
+ vogelheim@chromium.org

[Michael Achenbach, 2015-07-27 21:21:53]

PTAL

https://codereview.chromium.org/1257583005/diff/1/test/webkit/fast/js/excessi...
File test/webkit/fast/js/excessive-comma-usage-expected.txt (left):

https://codereview.chromium.org/1257583005/diff/1/test/webkit/fast/js/excessi...
test/webkit/fast/js/excessive-comma-usage-expected.txt:31: FAIL new
Function(commaExpressionTestString)() should be true. Threw exception
RangeError: Maximum call stack size exceeded
Since, we failed it, at least that part was quite useless until now. I don't
know if this test is of any use at all, but it's way too slow. Now it's at least
faster.

[commit-bot: I haz the power, 2015-07-27 21:30:53]

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

[commit-bot: I haz the power, 2015-07-27 21:30:54]

Dry run: This issue passed the CQ dry run.

[vogelheim, 2015-07-28 09:47:50]

lgtm

I suspect the test has some value, as a parser/compiler stress test. Keeping but
shortening it sounds good.

[Michael Achenbach, 2015-07-28 10:15:56]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-07-28 10:16:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1257583005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1257583005/1

[commit-bot: I haz the power, 2015-07-28 10:17:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-28 10:17:40]

Patchset 1 (id:??) landed as
https://crrev.com/d4d5663a2f432a97721a15044f118154a287a1ed
Cr-Commit-Position: refs/heads/master@{#29895}