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This updates NearbyShareAction to implement content::WebContentsDelegate
so that we can handle keyboard events. This was preventing users from
opening the feedback window.

This change also removes the need to subclass views::WebView, so
NearbyShareWebView is deleted. I confirmed via manual testing that links
are still working.

WebViewExample was used as a reference:
https://source.chromium.org/chromium/chromium/src/+/master:ui/views/examples/webview_example.h;drc=d5caa87ad320cc8ceb307f9cc525b7d4f9604dd1

Fixed: 1133817
Change-Id: Id9122ac0a92229a1ebbff66232d31d78ef2ddfcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597900
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838735}