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Ensure that the OobeWebViewDialog is the WebContentsDelegate for the
WebContents used in views-based sign-in/OOBE. This fixes
camera access by SAML providers on the sign-in screen, because
the versions of CheckMediaAccessPermission/RequestMediaAccessPermission
forwarding to MediaCaptureDevicesDispatcher are invoked again.

Move focus/keyboard handling from OobeUIDialogDelegate to
OobeWebViewDialog to make changing the delegate unnecessary.

Background:
WebDialogView usually acts as the WebContentsDelegate for the
WebContents it embeds. CL:1178111 introduced the subclasss
OobeWebDialogView which customizes the WebContentsDelegate handling to
allow media requests.
CL:1197785 then exchanged the WebContents' delegate altogether to
implement keyboard/focus handling, orphaning the functions introduced in
CL:1178111. This CL moves the keyboard/focus handling to the
OobeWebDialogView and restores its function as WebContentsDelegate.

Bug: 900323
Test: out/Default/browser_tests --gtest_filter=*SAMLPolicy*Test*TestLoginMedia*
Change-Id: I6c12b8b08efaa71a9f9cbb93d674448cdccbdeaf
Reviewed-on: https://chromium-review.googlesource.com/c/1323075
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Quan Nguyen <qnnguyen@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606111}