Remove redundantly setting WTF_VECTOR_INITIAL_SIZE in build/common.gypi

WTF_VECTOR_INITIAL_SIZE properly defaults to 4 in wtf/Vector.h. No need to overrule the WTF_VECTOR_INITIAL_SIZE macro in the global gyp configuration file any more.

BUG=285442
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=224573

[lgombos, 2013-09-20 18:03:59]

This seems a desired cleanup after https://codereview.chromium.org/23453040.

[abarth-chromium, 2013-09-20 18:05:25]

lgtm

[Chris Evans, 2013-09-20 18:06:23]

On 2013/09/20 18:03:59, lgombos wrote:
> This seems a desired cleanup after https://codereview.chromium.org/23453040.

LGTM.

I want to leave the corresponding Blink code in place for a while. The change is
still a bit fresh so I want to be equipped to handle any fallout by twiddling
WTF_VECTOR_INITIAL_SIZE :-)

[commit-bot: I haz the power, 2013-09-20 18:19:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/l.gombos@samsung.com/24246013/1

[commit-bot: I haz the power, 2013-09-21 01:57:49]

Retried try job too often on win_rel for step(s) sync_integration_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-09-21 02:00:03]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/l.gombos@samsung.com/24246013/1

[commit-bot: I haz the power, 2013-09-21 06:08:14]

Change committed as 224573