Fix variable shadowing warning in registry on VS2015

Fix variable shadowing warning in registry on VS2015

d:\src\cr3\src\base\win\registry.cc(665): error C2220: warning treated as error - no 'object' file generated
d:\src\cr3\src\base\win\registry.cc(665): warning C4456: declaration of 'result' hides previous local declaration
d:\src\cr3\src\base\win\registry.cc(659): note: see declaration of 'result'

I don't think there's any need for separate variables.

R=cpu@chromium.org
BUG=440500
Committed: https://crrev.com/91e3049633eebd097f548c20aabf94aac6e8907a
Cr-Commit-Position: refs/heads/master@{#313373}

[Will Harris, 2015-01-27 19:32:31]

lgtm

[scottmg, 2015-01-27 20:13:59]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-01-27 20:14:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868253004/1

[commit-bot: I haz the power, 2015-01-27 20:21:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-27 20:21:26]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[cpu_(ooo_6.6-7.5), 2015-01-27 20:27:25]

lgtm

[cpu_(ooo_6.6-7.5), 2015-01-27 20:27:31]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2015-01-27 20:28:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868253004/1

[commit-bot: I haz the power, 2015-01-27 20:28:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-27 20:28:36]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[scottmg, 2015-01-27 20:28:55]

Will was just taunting me apparently!

[Will Harris, 2015-01-27 20:50:49]

:)

[scottmg, 2015-01-27 22:09:16]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-01-27 22:10:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868253004/1

[commit-bot: I haz the power, 2015-01-27 22:12:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 22:14:19]

Patchset 1 (id:??) landed as
https://crrev.com/91e3049633eebd097f548c20aabf94aac6e8907a
Cr-Commit-Position: refs/heads/master@{#313373}