Negative loading for time unfinished bodiless requests.

BUG=339411

Review URL: https://codereview.chromium.org/151423002

git-svn-id: svn://svn.chromium.org/blink/trunk@166484 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unnecessary reinterpret_cast from V8GCController

Review URL: https://codereview.chromium.org/151003005

git-svn-id: svn://svn.chromium.org/blink/trunk@166485 bbb929c8-8fbe-4397-9dbb-9b2b20218538