On Windows, if intention for shared memory name is empty then we pass NULL.

On Windows, if intention for shared memory name is empty then we pass NULL.
With new appcontainer token in picture, it fails to create shared memory with empty name like "", it explicity seem to need NULL for anonymous.

BUG=455496
R=cpu

Committed: https://crrev.com/9426fb80a0cc758ed9686c48bb7642d23c229cfa
Cr-Commit-Position: refs/heads/master@{#317689}

[cpu_(ooo_6.6-7.5), 2015-02-23 23:16:29]

lgtm

[cpu_(ooo_6.6-7.5), 2015-02-23 23:16:33]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2015-02-23 23:17:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/950993003/1

[commit-bot: I haz the power, 2015-02-24 00:27:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-24 00:29:00]

Patchset 1 (id:??) landed as
https://crrev.com/9426fb80a0cc758ed9686c48bb7642d23c229cfa
Cr-Commit-Position: refs/heads/master@{#317689}