Fix jemalloc c4334 warnings when compiling win64

Fix jemalloc c4334 warnings when compiling win64 

BUG=166496
TBR=cpu
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=182353

[jschuh, 2013-02-13 14:07:12]

Just forcing the right type to avoid warnings on the undefined promotion.

[jar (doing other things), 2013-02-13 22:02:42]

lgtm

[commit-bot: I haz the power, 2013-02-13 22:06:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jschuh@chromium.org/12230011/1

[commit-bot: I haz the power, 2013-02-13 22:06:47]

Presubmit check for 12230011-1 failed and returned exit status 1.

INFO:root:Found 1 file(s).

Running presubmit commit checks ...
Running /b/commit-queue/workdir/chromium/PRESUBMIT.py
Running /b/commit-queue/workdir/chromium/third_party/PRESUBMIT.py

** Presubmit ERRORS **
Missing LGTM from an OWNER for files in these directories:
    third_party

Presubmit checks took 2.1s to calculate.

[jschuh, 2013-02-13 22:47:29]

@cpu - I assume it's okay to TBR an eng-reviewer in the case of a simple compile
fix in third_party?

[commit-bot: I haz the power, 2013-02-13 22:51:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jschuh@chromium.org/12230011/1

[commit-bot: I haz the power, 2013-02-13 23:31:27]

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

[commit-bot: I haz the power, 2013-02-13 23:44:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jschuh@chromium.org/12230011/1