Don't use two classes XWalkUIClientImpl and XWalkResourceClientImpl.

Both 2 classes are removed out of Crosswalk core library. Use
the public classes XWalkUIClient and XWalkResourceClient.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1481
Add two network related permissions to AndroidManifest.xml

XWalk Core library will auto detect network status, and below two permissions are needed:
  android.permission.ACCESS_NETWORK_STATE
  android.permission.ACCESS_WIFI_STATE
Add these two permissions to AndroidManifest.xml

BUG=XWALK-1480