Map WebURLRequest::RequestContextPlugin to RESOURCE_TYPE_OBJECT.

The WebRequest API should treat both object requests, and requests made
from those objects (e.g. Flash requesting an .mp4 resource) as type
Object. We used to do this, then I broke it. :( Now I'm fixing it. :)

BUG=410382
R=vabr@chromium.org

Review URL: https://codereview.chromium.org/630973002

Cr-Commit-Position: refs/heads/master@{#308787}
1 file changed