Remove unused imports from frameworks/base.

Change-Id: Ia1f99bd2c1105b0b0f70aa614f1f4a67b2840906

core/java/android/net/ConnectivityManager.java

@@ -25,7 +25,6 @@ import android.os.Binder;
 import android.os.Build.VERSION_CODES;
 import android.os.Messenger;
 import android.os.RemoteException;
-import android.os.ResultReceiver;
 import android.provider.Settings;
 
 import java.net.InetAddress;

core/java/android/net/DhcpInfo.java

@@ -18,7 +18,6 @@ package android.net;
 
 import android.os.Parcelable;
 import android.os.Parcel;
-import java.net.InetAddress;
 
 /**
  * A simple object for retrieving the results of a DHCP request.

core/java/android/net/NetworkConfig.java

@@ -16,7 +16,6 @@
 
 package android.net;
 
-import android.util.Log;
 import java.util.Locale;
 
 /**

core/java/android/net/ProxyProperties.java

@@ -22,7 +22,6 @@ import android.os.Parcelable;
 import android.text.TextUtils;
 
 import java.net.InetSocketAddress;
-import java.net.UnknownHostException;
 import java.util.Locale;
 
 /**

services/java/com/android/server/ConnectivityService.java

@@ -143,7 +143,6 @@ import java.net.Inet4Address;
 import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.URL;
-import java.net.URLConnection;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Arrays;