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The goal of this CL is to allow unneeded requests to be cancelled
when they are unlikely to be navigated to. This is achieved through
a few avenues of change:

-- When the user navigates to something in omnibox, the URL is reported
to Search Prefetch Service to be able to mark it as likely to be served
(using kCanBeServedAndUserClicked when the request is kCanBeServed).
This occurs before the omnibox is closed and all results are wiped.
-- kCanBeServed are wiped when omnibox closes.
-- Streaming requests will no longer pause the mojo channel, so they can
witness the Complete event to be able to make the request as complete.
-- As part of above, we store the response body in memory instead of
just handing off the data pipe. Data pipes have a 500k data limit, which
search requests typically go over. Net won't send the complete event
until all data is in the pipe. Therefore we store the data and create a
pipe to navigation if needed.
-- Full body implementation now reports kComplete where it used to
report kCanBeServed.

Bug: 1156325
Change-Id: Ied70a3eafd896801e263f631cb4d80556e762180
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583112Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835897}