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Cleanup. Use RenderFrameHostBrowserTest::web_contents().

RenderFrameHostImplBrowserTest defines: web_contents().
Tests can uses it, this is shorter and avoid doing many
static_cast everywhere.

This patch updates all the tests. This removes a lot of noise.
This is 97 line shorter and ~50 static_cast are removed.

By updating the whole file, goal is to make others start using it,
instead of copy-pasting the old lines over and over.

Bug: NONE
Change-Id: Id06e69150ace6d9ba70983411c4830cfa4012a43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2396117
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805247}