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WebContents::GetRenderProcessHost is an API that doesn't behave as
expected with out-of-process iframes, as multiple processes can be
associated with a single WebContents.  This CL replaces callers of this
API, so that they go through an equivalent API that explicitly selects
which frame's process is needed.

This CL was started by using an ad-hoc clang-plugin that replaced
existing callsites of WebContents::GetRenderProcessHost() with a call to
something like wc->GetMainFrame()->GetProcess().  This was followed-up
by manually adding an include of render_frame_host.h and git cl format
and git cl lint and then a self-review with small tweaks (e.g. sometimes
using a wc->GetRenderViewHost()->GetProcess() is more appropriate).

This CL was uploaded by git cl split.

R=treib@chromium.org

Bug: 666525
Change-Id: Iff2b7f18d4c593b10846eac3c8ec5a03a0b0ef6d
Reviewed-on: https://chromium-review.googlesource.com/689114Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505408}