Add ClearHistory() to ContentSuggestionsService and its providers

components/ntp_snippets/content_suggestions_service.cc

 // Copyright 2016 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.
 
 #include "components/ntp_snippets/content_suggestions_service.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
@@ skipping 63 matching lines @@
     LOG(WARNING) << "Requested image for suggestion " << suggestion_id
                  << " for unavailable category " << category;
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(callback, gfx::Image()));
     return;
   }
   providers_by_category_[category]->FetchSuggestionImage(suggestion_id,
                                                          callback);
 }
 
+void ContentSuggestionsService::ClearHistory(
+    base::Time begin,
+    base::Time end,
+    base::Callback<bool(const GURL& url)> filter) {
+  for (const auto& provider : providers_) {
+    provider->ClearHistory(begin, end, filter);
+  }
+}
+
 void ContentSuggestionsService::ClearAllCachedSuggestions() {
   suggestions_by_category_.clear();
   id_category_map_.clear();
   for (const auto& category_provider_pair : providers_by_category_) {
     category_provider_pair.second->ClearCachedSuggestions(
         category_provider_pair.first);
     FOR_EACH_OBSERVER(Observer, observers_,
                       OnNewSuggestions(category_provider_pair.first));
   }
 }
@@ skipping 189 matching lines @@
           if (left.IsKnownCategory(KnownCategories::BOOKMARKS))
             return false;
           if (right.IsKnownCategory(KnownCategories::BOOKMARKS))
             return true;
         }
         return category_factory_.CompareCategories(left, right);
       });
 }
 
 }  // namespace ntp_snippets