[NTPSnippets] Switch from TickClock to Clock for storing the last background fetched time.

components/ntp_snippets/remote/remote_suggestions_provider.h

 // Copyright 2015 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_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_
 
 #include <cstddef>
 #include <deque>
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/time/clock.h"
 #include "base/time/time.h"
 #include "components/image_fetcher/image_fetcher_delegate.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/category_factory.h"
 #include "components/ntp_snippets/category_status.h"
 #include "components/ntp_snippets/content_suggestion.h"
 #include "components/ntp_snippets/content_suggestions_provider.h"
 #include "components/ntp_snippets/remote/ntp_snippet.h"
 #include "components/ntp_snippets/remote/ntp_snippets_fetcher.h"
 #include "components/ntp_snippets/remote/ntp_snippets_scheduler.h"
@@ skipping 116 matching lines @@
     return category_contents_.find(category)->second.snippets;
   }
 
   // Dismissed snippets, only for unit tests.
   const NTPSnippet::PtrVector& GetDismissedSnippetsForTesting(
       Category category) const {
     return category_contents_.find(category)->second.dismissed;
   }
 
   // Overrides internal clock for testing purposes.
-  void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock) {
-    tick_clock_ = std::move(tick_clock);
+  void SetClockForTesting(std::unique_ptr<base::Clock> clock) {
+    clock_ = std::move(clock);
   }
 
  private:
   friend class RemoteSuggestionsProviderTest;
 
   FRIEND_TEST_ALL_PREFIXES(RemoteSuggestionsProviderTest,
                            DontNotifyIfNotAvailable);
   FRIEND_TEST_ALL_PREFIXES(RemoteSuggestionsProviderTest,
                            RemoveExpiredDismissedContent);
   FRIEND_TEST_ALL_PREFIXES(RemoteSuggestionsProviderTest,
@@ skipping 241 matching lines @@
   bool fetch_when_ready_;
 
   // Set to true if NukeAllSnippets is called while the service isn't ready.
   // The nuke will be executed once the service finishes initialization or
   // enters the READY state.
   bool nuke_when_initialized_;
 
   // Request throttler for limiting requests to thumbnail images.
   RequestThrottler thumbnail_requests_throttler_;
 
-  // A clock for getting the time. This allows to inject a tick clock in tests.
-  std::unique_ptr<base::TickClock> tick_clock_;
+  // A clock for getting the time. This allows to inject a clock in tests.
+  std::unique_ptr<base::Clock> clock_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteSuggestionsProvider);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_