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PrerenderProcessorImpl etc should not trust an initiator origin passed
from a renderer process that can be compromised. Instead of the passed
origin, this CL makes the prerender components use the origin given by
RenderFrameHostImpl::GetLastCommittedOrigin().

Bug: 1133185
Change-Id: I47b8ea93f9e73099fc1c1ef82eb19d8f9b71d86b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437713Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812049}