Revert of base: Remove using:: declaration from version.h header.

Revert of base: Remove using:: declaration from version.h header. (patchset #24 id:450001 of https://codereview.chromium.org/1281313003/ )

Reason for revert:
Broke all official bots, e.g. http://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Win/builds/1926/steps/compile/logs/stdio

c:\b\build\slave\google-chrome-rel-win\build\src\chrome\browser\component_updater\pepper_flash_component_installer.cc(326) :error C3861: 'Version': identifier not found

Original issue's description:
> base: Remove using:: declaration from version.h header.
>
> BUG=None
> R=brettw@chromium.org
>
> Committed: https://crrev.com/9c2f5dc9c732beb936b41d073bf5ec7adefb0872
> Cr-Commit-Position: refs/heads/master@{#344088}

TBR=brettw@chromium.org,tfarina@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Committed: https://crrev.com/37be69cfdb84f4fdabcb779f443d18bbc04f1ffb
Cr-Commit-Position: refs/heads/master@{#344138}

[Nico, 2015-08-19 03:25:37]

Created Revert of base: Remove using:: declaration from version.h header.

[commit-bot: I haz the power, 2015-08-19 03:25:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1301883002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1301883002/1

[commit-bot: I haz the power, 2015-08-19 03:27:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-19 03:27:56]

Patchset 1 (id:??) landed as
https://crrev.com/37be69cfdb84f4fdabcb779f443d18bbc04f1ffb
Cr-Commit-Position: refs/heads/master@{#344138}