Fix typo in the new chrome histograms.

Fixes a typo for the new SafeBrowsing histograms.  The cmd
variable might contain quotes which makes the code in
RecordUserReactionTime fail because strings don't match
the expected commands.

BUG=None
TEST=None

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=145823

[mattm, 2012-07-09 23:13:14]

lgtm

[commit-bot: I haz the power, 2012-07-09 23:16:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noelutz@google.com/10750013/1

[commit-bot: I haz the power, 2012-07-10 00:21:39]

Try job failure for 10750013-1 (retry) on win_rel for step "compile" (clobber
build).
It's a second try, previously, step "compile" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2012-07-10 00:42:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noelutz@google.com/10750013/1

[commit-bot: I haz the power, 2012-07-10 02:05:41]

Change committed as 145823