For large object allocations, do not clear already zeroed memory.

The page memory regions are allocated with OS calls that already 
guarantee that the pages returned are all zeroes.

R=haraken
BUG=420515

Review URL: https://codereview.chromium.org/827423002

git-svn-id: svn://svn.chromium.org/blink/trunk@187807 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: ec9dab6d921bc1f415d0b27e9b02be7f83cb520a
  1. third_party/