Oilpan: remove unnecessary WeakMember friend class decl.

R=kouhei
BUG=420515

Review URL: https://codereview.chromium.org/792233006

git-svn-id: svn://svn.chromium.org/blink/trunk@187381 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: 1ea8aa5aa064e94891601988d3b5d1e0db7a2517
  1. third_party/