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If a new navigation has started before |webView:didFinishNavigation|
arrives, early exit and stop processing.

Bug: 851708
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iea6ed9be60a547bc3fc2ee5bad6104b3a9eaef40
Reviewed-on: https://chromium-review.googlesource.com/1097564
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566566}