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The histogram values for an extension function are used to report
API call activity and related metrics for extension functions. Each
extension function should have a unique histogram value, but some of
them were erroneously copy-pasted. This leads to incorrect metrics, both
with not reporting one function and over-reporting another.

Fix the instances where the histogram values were duplicated, and add a
browser test that ensures each function has a unique histogram value.

Bug: 827601

Change-Id: Ic44519ca83fe0cf4b3a1896a16232f6400b6c79d
Reviewed-on: https://chromium-review.googlesource.com/988227
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548654}