The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/651a683190d2a06681c50f00da755819b4543bdf

commit 651a683190d2a06681c50f00da755819b4543bdf
Author: Kyle Milka <kmilka@chromium.org>
Date: Thu Aug 16 17:16:42 2018

[NTP] Remove flag for the OGB on the Local NTP

As the feature is enabled by default the flag is no longer
necessary. The api override url is now never used and is also
removed.

Bug:  874095 
Change-Id: I82a102ba9935b8ab25fa8a986aab9741c8ac8670
Reviewed-on: https://chromium-review.googlesource.com/1174911
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583706}
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/about_flags.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/extensions/api/web_request/web_request_apitest.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/search/one_google_bar/one_google_bar_loader_impl.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/search/one_google_bar/one_google_bar_loader_impl.h
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/search/one_google_bar/one_google_bar_loader_impl_unittest.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/search/one_google_bar/one_google_bar_service_factory.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/browser/ui/search/local_ntp_one_google_bar_browsertest.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/common/chrome_features.cc
[modify] https://crrev.com/651a683190d2a06681c50f00da755819b4543bdf/chrome/common/chrome_features.h