HAVE(MMAP), HAVE(VASPRINTF) and HAVE(DISPATCH_H) guards are no longer used, we should remove them.

Review URL: https://codereview.chromium.org/165183003

git-svn-id: svn://svn.chromium.org/blink/trunk@167154 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Move Crypto module to oilpan's heap

Crypto is touched by workers, so Crypto objects has to be added to USED_FROM_MULTIPLE_THREADS macros.

BUG=340522

Review URL: https://codereview.chromium.org/149613005

git-svn-id: svn://svn.chromium.org/blink/trunk@167155 bbb929c8-8fbe-4397-9dbb-9b2b20218538