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PageStatus.TIMEOUT isn't used, so remove it and the associated HTML
content and string.

PageStatus.SPINNER is used as the default state for the page, but isn't
sent from C++, so eliminate the C++ constant.

Bug: none
Change-Id: I93b2dadb9bb6cf762faed3a825f0b2eda2ad4308
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050033
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740598}