Fix component build for blink_heap.

R=adamk@chromium.org, vegorov@chromium.org
BUG=332220

Review URL: https://codereview.chromium.org/128183002

git-svn-id: svn://svn.chromium.org/blink/trunk@164687 bbb929c8-8fbe-4397-9dbb-9b2b20218538