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This change adds a show password button directly in chrome://settings/passwords
to reduce the number of clicks necessary to view a given password.

Bug: 670986
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If54c92d2ee6c2e64f90a5280e59a4c59af182740
Reviewed-on: https://chromium-review.googlesource.com/575143
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491454}