Remove forced site support from TopSites

This change removes forced sites from TopSites/Impl and TopSitesCache.
Forced URLs are only used to store thumbnails from Most Likely sites,
and NTP thumbnails have been deprecated as of M69.

Bug: 893362
Change-Id: Ib35ad05ba7e9a8fd558e8a12fe6636c3f2695e7c
Reviewed-on: https://chromium-review.googlesource.com/c/1375097
Commit-Queue: Kristi Park <[email protected]>
Reviewed-by: Karan Bhatia <[email protected]>
Reviewed-by: Sylvain Defresne <[email protected]>
Reviewed-by: Patrick Monette <[email protected]>
Reviewed-by: Thomas Anderson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#616846}
diff --git a/components/omnibox/browser/zero_suggest_provider.cc b/components/omnibox/browser/zero_suggest_provider.cc
index 0a63c481..70aec92 100644
--- a/components/omnibox/browser/zero_suggest_provider.cc
+++ b/components/omnibox/browser/zero_suggest_provider.cc
@@ -173,8 +173,7 @@
 
     ts->GetMostVisitedURLs(
         base::Bind(&ZeroSuggestProvider::OnMostVisitedUrlsAvailable,
-                   weak_ptr_factory_.GetWeakPtr(), most_visited_request_num_),
-        false);
+                   weak_ptr_factory_.GetWeakPtr(), most_visited_request_num_));
     return;
   }