[Extensions Cleanup] Remove unnecessary method in ThrottleManager

23b3d3cf766dc2073fac457ae3a2baa3a3517b6e migrated away from two
network changed-related observer methods to one. Previously, both of
these methods called a common implementation in OnNetworkChanged. Now,
we can just put the implementation directly in the observer method.

Bug: None

Change-Id: I6f8d370bde6bbdfa2c3d0621670310fb1f009ab5
Reviewed-on: https://chromium-review.googlesource.com/770515
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518834}
2 files changed