Move X509TrustManagerExtensions to correct directory

Also removed unused imports.

Original Change-Id: If117ffd2240a7bf3437115f3cf2f766c4e249600

Change-Id: I66886ee9792c23a1e421022fd1f675fdf35ea049

Author: andrewstadler

…roid/net/X509TrustManagerExtensions.java …net/http/X509TrustManagerExtensions.javacore/java/android/net/X509TrustManagerExtensions.java renamed to core/java/android/net/http/X509TrustManagerExtensions.java core/java/android/net/X509TrustManagerExtensions.java renamed to core/java/android/net/http/X509TrustManagerExtensions.java

@@ -16,15 +16,14 @@
 
 package android.net.http;
 
+import org.apache.harmony.xnet.provider.jsse.TrustManagerImpl;
+
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
-import java.security.KeyManagementException;
 import java.util.List;
 
 import javax.net.ssl.X509TrustManager;
 
-import org.apache.harmony.xnet.provider.jsse.TrustManagerImpl;
-
 /**
  * X509TrustManager wrapper exposing Android-added features.
  *