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It is desirable (see https://crbug.com/1031119) to focus tab contents
when a navigation is triggered by dropping a link or a file onto the
browser window.

Before this CL, tab contents would be focused any time the OpenURL code
path is used, but not in BeginNavigation code path.  This meant that
dropping a local file (e.g. navigating to a file: URL) would result
in focusing the tab contents (possibly moving the focus away from the
omnibox), but other navigations (e.g. navigating to a https: URL)
would not affect focus.

After this CL any "drop" focuses the WebContents.

Bug: 1042271
Change-Id: Ib1db79faec6e32846747d1cde9a78450dc354b42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003079Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734245}