Using 23 instead of Build.Versoin.M until the final SDK is available.

Change-Id: I9f8f6fe049afcd0ceb0797ddc803a2e77bab0437
diff --git a/src/com/android/launcher3/InvariantDeviceProfile.java b/src/com/android/launcher3/InvariantDeviceProfile.java
index 631333b..5914f44 100644
--- a/src/com/android/launcher3/InvariantDeviceProfile.java
+++ b/src/com/android/launcher3/InvariantDeviceProfile.java
@@ -20,7 +20,6 @@
 import android.app.ActivityManager;
 import android.content.Context;
 import android.graphics.Point;
-import android.os.Build;
 import android.util.DisplayMetrics;
 import android.view.Display;
 import android.view.WindowManager;
@@ -120,7 +119,7 @@
         defaultLayoutId = dlId;
     }
 
-    @TargetApi(Build.VERSION_CODES.M)
+    @TargetApi(23)
     InvariantDeviceProfile(Context context) {
         WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
         Display display = wm.getDefaultDisplay();