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We have stopped using (Get|Set)LargestChangestamp in favor of
(Get|Set)StartPageToken. This CL removes the code and fixes the UI
to display the start page token instead.

We leave (Get|Set)LargestChangestamp in resource metadata storage to
facilitate DB upgrades, where we write the existing largest changestamp
to the start page token field.

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I57c8f61e3914cdfd3ea15046c8551f0456f9e636
Reviewed-on: https://chromium-review.googlesource.com/1071149Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561623}