Bug 897252 - Don't create additional history sections every time a new cursor is loaded. r=lucasr

mobile/android/base/home/HistoryPage.java

@@ -215,6 +215,9 @@ public class HistoryPage extends HomeFragment {
             return;
         }
 
+        // Clear any history sections that may have been loaded before.
+        mHistorySections.clear();
+
         final Date now = new Date();
         now.setHours(0);
         now.setMinutes(0);