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This is a follow-up CL for crrevc.com/c/2387801 to remove the methods
SetMouseOverURL() and SetKeyboardFocusURL() from WebViewClient, along
with their implementations in RenderViewImpl, and move the logic right
into WebViewImpl instead.

Additionally, this CL also removes a couple of leftover declarations
in render_view_impl.h for methods that were moved to WebViewImpl along
with crrev.com/c/2387801 already.

Bug: 993189, 1047464
Change-Id: I5e8b13b1db955272308490c82c97ff96e428a64e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403260Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#805736}