[Suggestions] Remove support for a Control logging group.

components/suggestions/suggestions_service.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_H_
 #define COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 19 matching lines @@
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
 
 namespace suggestions {
 
 class BlacklistStore;
 class SuggestionsStore;
 
-extern const char kSuggestionsFieldTrialName[];
-extern const char kSuggestionsFieldTrialControlParam[];
-extern const char kSuggestionsFieldTrialStateEnabled[];
-extern const char kSuggestionsFieldTrialStateParam[];
-
 extern const char kSuggestionsURL[];
 extern const char kSuggestionsBlacklistURLPrefix[];
 extern const char kSuggestionsBlacklistURLParam[];
 extern const int64 kDefaultExpiryUsec;
 
 // An interface to fetch server suggestions asynchronously.
 class SuggestionsService : public KeyedService, public net::URLFetcherDelegate {
  public:
   typedef base::Callback<void(const SuggestionsProfile&)> ResponseCallback;
 
   // Class taking ownership of |suggestions_store|, |thumbnail_manager| and
   // |blacklist_store|.
   SuggestionsService(
       net::URLRequestContextGetter* url_request_context,
       scoped_ptr<SuggestionsStore> suggestions_store,
       scoped_ptr<ImageManager> thumbnail_manager,
       scoped_ptr<BlacklistStore> blacklist_store);
   ~SuggestionsService() override;
 
-  // Whether the user is part of a control group.
-  static bool IsControlGroup();
-
   // Request suggestions data, which will be passed to |callback|. |sync_state|
   // will influence the behavior of this function (see SyncState definition).
   //
   // |sync_state| must be specified based on the current state of the system
   // (see suggestions::GetSyncState). Callers should call this function again if
   // sync state changes.
   //
   // If state allows for a network request, it is initiated unless a pending one
   // exists, to fill the cache for next time.
   void FetchSuggestionsData(SyncState sync_state,
@@ skipping 110 matching lines @@
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<SuggestionsService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestionsService);
 };
 
 }  // namespace suggestions
 
 #endif  // COMPONENTS_SUGGESTIONS_SUGGESTIONS_SERVICE_H_