Add sigbjornf as platform/heap owner.
Add sigbjornf as platform/heap owner.

R=
BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/717393004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185352 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs