Move browsing_data counter sync tests to separate file

components/browsing_data/core/counters/history_counter.cc

Index: components/browsing_data/core/counters/history_counter.cc
diff --git a/components/browsing_data/core/counters/history_counter.cc b/components/browsing_data/core/counters/history_counter.cc
index 0061bb1c7ee290b05bab14d3896a6cf630b5b690..fd22f4a7c65daa969be92b72fa9a54aa15c7e4d6 100644
--- a/components/browsing_data/core/counters/history_counter.cc
+++ b/components/browsing_data/core/counters/history_counter.cc
@@ -102,7 +102,6 @@ void HistoryCounter::OnGetLocalHistoryCount(
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (!result.success) {
-    LOG(ERROR) << "Failed to count the local history.";
     return;
   }
 
@@ -151,17 +150,10 @@ void HistoryCounter::MergeResults() {
   if (!local_counting_finished_ || !web_counting_finished_)
     return;
 
-  ReportResult(
-      base::MakeUnique<HistoryResult>(this, local_result_, has_synced_visits_));
+  ReportResult(base::MakeUnique<HistoryResult>(
+      this, local_result_, history_sync_enabled_, has_synced_visits_));
 }
 
-HistoryCounter::HistoryResult::HistoryResult(const HistoryCounter* source,
-                                             ResultInt value,
-                                             bool has_synced_visits)
-    : FinishedResult(source, value), has_synced_visits_(has_synced_visits) {}
-
-HistoryCounter::HistoryResult::~HistoryResult() {}
-
 void HistoryCounter::OnStateChanged(syncer::SyncService* sync) {
   bool history_sync_enabled_new_state = !!web_history_service_callback_.Run();
 
@@ -173,4 +165,13 @@ void HistoryCounter::OnStateChanged(syncer::SyncService* sync) {
   }
 }
 
+HistoryCounter::HistoryResult::HistoryResult(const HistoryCounter* source,
+                                             ResultInt value,
+                                             bool is_sync_enabled,
+                                             bool has_synced_visits)
+    : SyncResult(source, value, is_sync_enabled),
+      has_synced_visits_(has_synced_visits) {}
+
+HistoryCounter::HistoryResult::~HistoryResult() {}
+
 }  // namespace browsing_data