Remove unused android.content.pm.PackageManager (#210)

diff --git a/src/main/java/com/google/android/mobly/snippet/bundled/WifiManagerSnippet.java b/src/main/java/com/google/android/mobly/snippet/bundled/WifiManagerSnippet.java
index cb1cc98..2185762 100644
--- a/src/main/java/com/google/android/mobly/snippet/bundled/WifiManagerSnippet.java
+++ b/src/main/java/com/google/android/mobly/snippet/bundled/WifiManagerSnippet.java
@@ -20,7 +20,6 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.pm.PackageManager;
 import android.net.ConnectivityManager;
 import android.net.Network;
 import android.net.NetworkCapabilities;