Fix build issues in net/ for Android x64

net/android/java/src/org/chromium/net/RemoteAndroidKeyStore.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.os.RemoteException;
 import android.util.Log;
 
 /**
@@ skipping 92 matching lines @@
     }
 
     @Override
     public byte[] getPrivateKeyEncodedBytes(AndroidPrivateKey key) {
         // This should not be called as it's only for older versions of Android.
         assert false;
         return null;
     }
 
     @Override
-    public int getOpenSSLHandleForPrivateKey(AndroidPrivateKey privateKey) {
+    public long getOpenSSLHandleForPrivateKey(AndroidPrivateKey privateKey) {
         // This should not be called as it's only for older versions of Android.
         assert false;
         return 0;
     }
 
     public AndroidPrivateKey createKey(String alias) {
         try {
             int handle = mRemoteManager.getPrivateKeyHandle(alias);
             return new RemotePrivateKey(handle, this);
         } catch (RemoteException e) {
             e.printStackTrace();
             return null;
         }
     }
 
     @Override
     public void releaseKey(AndroidPrivateKey key) {
         RemotePrivateKey remoteKey = (RemotePrivateKey) key;
         try {
             Log.d(TAG, "releaseKey");
             mRemoteManager.releaseKey(remoteKey.getHandle());
         } catch (RemoteException e) {
             e.printStackTrace();
         }
     }
 }