Move cronet from //net into //components.

components/cronet/android/java/src/org/chromium/net/UserAgent.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.net;
 
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
@@ skipping 54 matching lines @@
                     sVersionCode = packageInfo.versionCode;
                 } catch (NameNotFoundException e) {
                     throw new IllegalStateException(
                             "Cannot determine package version");
                 }
             }
             return sVersionCode;
         }
     }
 }