Prerender: Remove chrome/renderer/prerender/

This directory contains only OWNERS file. Files existed there were moved
into components/ for supporting NoStatePrefetch on WebLayer, for
example, by https://crrev.com/c/2310329.

Bug: 1096088
Change-Id: Ie22858163b75cfb825acaca8b01017a4a04b0afa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463050Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816308}

chrome/renderer/prerender/OWNERS

-file://chrome/browser/prerender/OWNERS
-
-# COMPONENT: Internals>Preload