Replaces call to RenderViewImpl::webview() by GetWebView()

.. the remove the former.

Drive by CL. Both methods are identical.

BUG=None
R=haraken@chromium.org
TBR=kinuko@chromium.org

Change-Id: I664c6289d89ef9b8335d3346c295485bd9312a89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2069571
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743920}
14 files changed