Don't duplicate RouterContextProvider interface

src/net/i2p/android/router/activity/NetDbActivity.java

@@ -13,7 +13,6 @@ import android.support.v7.app.ActionBar;
 import android.support.v7.app.ActionBar.Tab;
 
 public class NetDbActivity extends I2PActivityBase implements
-        NetDbListFragment.RouterContextProvider,
         NetDbListFragment.OnEntrySelectedListener {
     /**
      * Whether or not the activity is in two-pane mode, i.e. running on a tablet

src/net/i2p/android/router/fragment/NetDbListFragment.java

@@ -4,6 +4,7 @@ import java.util.List;
 
 import net.i2p.android.router.R;
 import net.i2p.android.router.adapter.NetDbEntryAdapter;
+import net.i2p.android.router.fragment.I2PFragmentBase.RouterContextProvider;
 import net.i2p.android.router.loader.NetDbEntry;
 import net.i2p.android.router.loader.NetDbEntryLoader;
 import net.i2p.data.Hash;
@@ -42,11 +43,6 @@ public class NetDbListFragment extends ListFragment
     private int mActivatedPosition = ListView.INVALID_POSITION;
     private boolean mActivateOnItemClick = false;
 
-    // Container Activity must implement this interface
-    public interface RouterContextProvider {
-        public RouterContext getRouterContext();
-    }
-
     // Container Activity must implement this interface
     public interface OnEntrySelectedListener {
         public void onEntrySelected(boolean isRouterInfo, Hash entryHash);