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BrowserPlugins make URL requests on behalf of object tags. Requests on behalf of
object tags should be treated in a similar way to requests in behalf of frames
in that they are allowed to be intercepted as a stream request, however unlike frames they should never be downloaded. This CL allows
these requests to be intercepted in that way.

BUG=416310
TBR=mkosiba@chromium.org,benwells@chromium.org

Review URL: https://codereview.chromium.org/694773003

Cr-Commit-Position: refs/heads/master@{#305130}