Remove unecessary malloc seen in http://sina.com.cn (#17)

Remove unecessary malloc seen in http://sina.com.cn (#17)

Content calls down into Blink a bunch of times during loading to
check the document's encoding.  Every time we were allocating a
new copy of a constant string.  The right fix is to fix TextEncoding
to have fancier static-string technology, but this is the quick-fix
to get this malloc off the profile of http://sina.com.cn.

BUG=261689
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=154508

[abarth-chromium, 2013-07-17 23:57:22]

lgtm

[commit-bot: I haz the power, 2013-07-17 23:58:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eseidel@chromium.org/19663003/1

[commit-bot: I haz the power, 2013-07-18 01:56:09]

Retried try job too often on linux_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[commit-bot: I haz the power, 2013-07-18 19:24:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eseidel@chromium.org/19663003/1

[commit-bot: I haz the power, 2013-07-18 19:40:32]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[commit-bot: I haz the power, 2013-07-18 19:47:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eseidel@chromium.org/19663003/1

[commit-bot: I haz the power, 2013-07-18 19:48:13]

Change committed as 154508