I am working on this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/23b3d3cf766dc2073fac457ae3a2baa3a3517b6e

commit 23b3d3cf766dc2073fac457ae3a2baa3a3517b6e
Author: shahriar rostami <shahriar.rostami@gmail.com>
Date: Mon Nov 06 08:23:40 2017

Replaced obsolete observers with NetworkChangeObserver

This CL migrates ExtensionThrottleManager to use NetworkChangeObserver instead
of depecated IPAddressObserver and ConnectionTypeObserver.

Bug:  780466 
Change-Id: I9b829b9d47768b341e960fa2f3b8985ebec6e51c
Reviewed-on: https://chromium-review.googlesource.com/754590
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514098}
[modify] https://crrev.com/23b3d3cf766dc2073fac457ae3a2baa3a3517b6e/extensions/browser/extension_throttle_manager.cc
[modify] https://crrev.com/23b3d3cf766dc2073fac457ae3a2baa3a3517b6e/extensions/browser/extension_throttle_manager.h
[modify] https://crrev.com/23b3d3cf766dc2073fac457ae3a2baa3a3517b6e/extensions/browser/extension_throttle_unittest.cc

Apologies, applied the wrong component in bulk.

Fixed by shahriar rostami.