Fix CM test

http://b/issue?id=6125619

Change-Id: I33306619424ab54281aaf592c78581179ebbfc6e

Author: Xia Wang

core/tests/ConnectivityManagerTest/src/com/android/connectivitymanagertest/ConnectivityManagerTestActivity.java

@@ -241,6 +241,7 @@ protected void onCreate(Bundle savedInstanceState) {
         mCM = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
         // Get an instance of WifiManager
         mWifiManager =(WifiManager)getSystemService(Context.WIFI_SERVICE);
+        mContext = this;
         mChannel = mWifiManager.initialize(mContext, mContext.getMainLooper(), null);
 
         initializeNetworkStates();