Remove RenderFrameImpl::committing_main_request_

This is not needed since we are not using WebURLRequest
for navigations anymore.

Bug: 855189
Change-Id: I61131ded0d6e4ab1b05834d278209a3c095ca0ea
Reviewed-on: https://chromium-review.googlesource.com/c/1424163
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626731}
2 files changed