Oilpan: remove unused typed pointer cast operation over (Weak)Member.

R=haraken
BUG=420515

Review URL: https://codereview.chromium.org/808053003

git-svn-id: svn://svn.chromium.org/blink/trunk@187809 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: 04016609862a1b5169be4e15882a3bf02c91f416
  1. third_party/