[chromium] Unreviewed DEPS roll.

Roll Chromium DEPS to 179332.

* DEPS:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141130 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[chromium] Unreviewed build fix.

Revert my revert at 141033 which can cause deadlock.

* platform/graphics/chromium/DiscardablePixelRef.cpp:
(WebCore::DiscardablePixelRefAllocator::allocPixelRef):
(WebCore::DiscardablePixelRef::DiscardablePixelRef):
* platform/graphics/chromium/DiscardablePixelRef.h:
(DiscardablePixelRef):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141131 268f45cc-cd09-0410-ab3c-d52691b4dbfc