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This only affects renderer-created windows.  It resumes blocked requests
for the RenderFrameHost, which is currently a no-op (until we start routing
network requests through RenderFrameHost rather than RenderViewHost).

BUG=414947
TEST=RFH's requests unblocked after window.open.  (No behavior change.)

Review URL: https://codereview.chromium.org/577793002

Cr-Commit-Position: refs/heads/master@{#295286}