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This CL removes -resetAllWebviews, which no longer has any call sites.

This CL also removes -ensureViewCreated, which is just our implementation
of [UIViewController loadViewIfNeeded], which has been available since
iOS9. 

Bug: 
Change-Id: Ia2adab95a7a5726114a7e81ce784aaa4e40aa676
Reviewed-on: https://chromium-review.googlesource.com/570019
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487434}