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This CL is a precursor CL for https://crrev.com/c/969098. It simply contains a
file renaming to keep log history:

1. content_main_runner.cc rename to content_main_runner_impl.cc
2. browser_main_runner.cc rename to browser_main_runner_impl.cc

It allows to introduce content_main_runner_impl.h and browser_main_runner_impl.h
which contain new methods without changing their interface in /content/public.

Bug: 740677
Change-Id: I4e42bb594d65888b4358ac843b13837be26a5b7e
Reviewed-on: https://chromium-review.googlesource.com/1042456
Commit-Queue: Xi Han <hanxi@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557620}