Modify allocator to use malloc for the realloc(0, size) case. This works around webkit sensitivity to allocators that return  zero in this case.
Modify allocator to use malloc for the realloc(0, size) case.
This works around webkit sensitivity to allocators that return 
zero in this case.

BUG=20200
TEST=none

Review URL: http://codereview.chromium.org/302005

git-svn-id: http://src.chromium.org/svn/trunk/src@29425 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e1cd805570ec4bc28684d0a7e10acd5335d97b65
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser