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This CL fixes the testWebViewIsFirstResponderUponKeyPress test which was
failing for iOS 11.3+. The changes in iOS 11.3+ is that the WKWebView is
the first responder instead of the WKContentView.

Bug: 830124, 837564
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I9b5c343579657c5db9d3973820e5c67ae495bcb4
Reviewed-on: https://chromium-review.googlesource.com/1052008Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557169}