Don't private classes or methods of support libraries

app/src/main/java/com/hippo/ehviewer/ui/SettingsActivity.java

@@ -77,7 +77,7 @@ public final class SettingsActivity extends EhPreferenceActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setActionBarUpIndicator(DrawableManager.getDrawable(this, R.drawable.v_arrow_left_dark_x24));
+        setActionBarUpIndicator(DrawableManager.getVectorDrawable(this, R.drawable.v_arrow_left_dark_x24));
     }
 
     @Override