Removing unused imports (#9108)

Author: Piinks

shell/platform/android/io/flutter/view/FlutterMain.java

@@ -4,9 +4,7 @@
 
 package io.flutter.view;
 
-import android.app.PendingIntent;
 import android.content.Context;
-import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.res.AssetManager;