Removing more code with API 21 dependencies.

Change-Id: I16c914334ce0694b84626269ae4bb5e83082c739
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 58c4cf7..4c5bba9 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2448,7 +2448,9 @@
             return;
         }
 
-        if (LauncherAppState.getInstance().getAccessibilityDelegate().onBackPressed()) {
+        LauncherAccessibilityDelegate delegate =
+                LauncherAppState.getInstance().getAccessibilityDelegate();
+        if (delegate != null && delegate.onBackPressed()) {
             return;
         }