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With NavigationMojoResponse, the NavigationURLLoaderImpl is waiting for
both the response_head and the response_body before unbinding the
URLLoader/URLLoaderClient

Without NavigationMojoResponse, it was happening after receiving the
response_head.

Code to support both depending on the flag was unpleasant to read, but
necessary. Now that NavigationMojoResponse is fully landed, it can be
simplified.

Bug: 1017710
Change-Id: Ic69b2c03072e60162c72927c0a6d8e56071d99b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120473Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753237}