Fix non-components Win Debug build of extensions_unittests

Fix non-components Win Debug build of extensions_unittests

It needs to depend on the allocator gyp target to pick up the
/NODEFAULTLIBS flags for libcmt.lib and libcmtd.lib and avoid
link errors about multiple definitions of allocation related
symbols.

BUG=
TEST=extensions_unittests links in non-components Debug build on Win

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284632

[hans, 2014-07-21 20:37:14]

extensions_unittests started failing on the Win-Clang Dbg bot sometime last week
(http://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20Clang%20%2...).
I'm not sure what caused it to fail, but this fixes it.

[tfarina, 2014-07-21 23:03:20]

I don't know nothing about base/allocator so I can't say if this is correct or
if there is a better way.

+Benjamin -> extensions/OWNERS
+Dai for allocator

[not at google - send to devlin, 2014-07-21 23:10:20]

Hopefully either jyasskin or yoz can say something informed.

[Yoyo Zhou, 2014-07-21 23:34:57]

I'm not familiar with base/allocator either. =( However, I see this pattern all
over our gyp files, so LGTM by consensus.

[hans, 2014-07-21 23:36:50]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2014-07-21 23:37:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hans@chromium.org/394353008/1

[commit-bot: I haz the power, 2014-07-22 02:51:15]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[commit-bot: I haz the power, 2014-07-22 03:27:43]

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

[commit-bot: I haz the power, 2014-07-22 03:27:44]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[hans, 2014-07-22 03:56:15]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2014-07-22 03:57:07]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hans@chromium.org/394353008/1

[commit-bot: I haz the power, 2014-07-22 05:10:13]

Change committed as 284632