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This change fixes up the GstaticFetchHttpResponseCode and
GstaticFetchResult histograms in PasswordManager.WellKnownChangePassword
to use `enum` instead of `units`.

R=chromium-metrics-reviews@google.com

Bug: 927473
Change-Id: I23e8838e065dd21bc433747f64a54d2a85da6f47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485229
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821989}