Fix v8 Windows GN build.

Fix v8 Windows GN build.

The paths for some of the Windows-specific files was incorrect.

R=jochen@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22455

[jochen (gone - plz use gerrit), 2014-07-17 17:07:09]

lgtm

[brettw, 2014-07-17 17:21:52]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2014-07-17 17:22:33]

CQ is trying da patch. Follow status at
 https://v8-status.appspot.com/cq/brettw@chromium.org/402693002/1

[commit-bot: I haz the power, 2014-07-17 17:22:34]

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

[commit-bot: I haz the power, 2014-07-17 17:22:34]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jochen (gone - plz use gerrit), 2014-07-17 17:38:02]

there's no commit bot for v8 yet

[jochen (gone - plz use gerrit), 2014-07-17 17:40:01]

Committed patchset #1 manually as r22455 (presubmit successful).

[brettw, 2014-07-17 17:58:56]

thanks.