Make it possible to build url/ without ICU on android.

url/android/url_jni_registrar.h

+// 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.
+
+#ifndef URL_ANDROID_URL_JNI_REGISTRAR_H_
+#define URL_ANDROID_URL_JNI_REGISTRAR_H_
+
+#include <jni.h>
+
+#include "url/url_export.h"
+
+namespace url {
+namespace android {
+
+// Register all JNI bindings necessary for url.
+URL_EXPORT bool RegisterJni(JNIEnv* env);
+
+}  // namespace android
+}  // namespace url
+
+#endif  // URL_ANDROID_URL_JNI_REGISTRAR_H_