The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e3f276cf3b3b1198fd2219f236c02b9480d50108

commit e3f276cf3b3b1198fd2219f236c02b9480d50108
Author: Vitalii Iarko <vitaliii@chromium.org>
Date: Tue Jun 13 08:16:04 2017

[NTP::Articles::Cleanup] Add RemoteSuggestionsFetcher interface.

This CL adds RemoteSuggestionsFetcher interface. The existing
implementation is renamed to RemoteSuggestionsFetcherImpl. Some includes
are removed and some are added.

This is needed to mock RemoteSuggestionsFetcher in
RemoteSuggestionsProviderImpl tests.

Bug:  731698 
Change-Id: Ib688de74e519d8bdb81be1d7d007c8305ae6361a
Reviewed-on: https://chromium-review.googlesource.com/529245
Commit-Queue: vitaliii <vitaliii@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478930}
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/chrome/browser/ui/webui/snippets_internals_message_handler.cc
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/BUILD.gn
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/json_to_categories.h
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_fetcher.cc
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_fetcher.h
[add] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_fetcher_impl.cc
[add] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_fetcher_impl.h
[rename] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_fetcher_impl_unittest.cc
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc
[modify] https://crrev.com/e3f276cf3b3b1198fd2219f236c02b9480d50108/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc