Remove remaining dependencies on allocation.h from a few platform files

I could move parts of allocation to base/ instead, but I see little to
no value in the allocation base classes, soo..

BUG=none
R=bmeurer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/351683009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22062 ce2b1a6d-e550-0410-aec6-3dcde31c8c00