Fix build issues in net/ for Android x64

net/android/java/src/org/chromium/net/AndroidKeyStore.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 org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 
 /**
@@ skipping 117 matching lines @@
      *
      * To better understand what's going on below, please refer to the
      * following source files in the Android 4.0.4 and 4.1 source trees:
      * libcore/luni/src/main/java/org/apache/harmony/xnet/provider/jsse/OpenSSLRSAPrivateKey.java
      * libcore/luni/src/main/native/org_apache_harmony_xnet_provider_jsse_NativeCrypto.cpp
      *
      * @param key The PrivateKey handle.
      * @return The EVP_PKEY handle, as a 32-bit integer (0 if not available)
      */
     @CalledByNative
-    int getOpenSSLHandleForPrivateKey(AndroidPrivateKey key);
+    long getOpenSSLHandleForPrivateKey(AndroidPrivateKey key);
 
     /**
      * Called when the native OpenSSL engine no longer needs access to the underlying key.
      */
     @CalledByNative
     void releaseKey(AndroidPrivateKey key);
 }