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This CL removes the pin to shelf toggle from the metadata view and places it
as the first row item.

The pin to shelf item is also hidden for the main browser app.

Bug: 977054, 971528, 965906
Change-Id: I4699adff9effb61711407ffa7876b2e10195d876
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670630
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676228}