Add missing using declarations in cronet code.

url/url_canon_icu_alternatives_android.cc

 // 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.
 
 #include <string.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "jni/IDNStringUtil_jni.h"
 #include "url/url_canon_internal.h"
 
+using base::android::ScopedJavaLocalRef;
+
 namespace url {
 
 // This uses the JDK's conversion function, which uses IDNA 2003, unlike the
 // ICU implementation.
 bool IDNToASCII(const base::char16* src, int src_len, CanonOutputW* output) {
   DCHECK_EQ(0, output->length());  // Output buffer is assumed empty.
 
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jstring> java_src =
       base::android::ConvertUTF16ToJavaString(
           env, base::StringPiece16(src, src_len));
   ScopedJavaLocalRef<jstring> java_result =
       android::Java_IDNStringUtil_idnToASCII(env, java_src.obj());
   // NULL indicates failure.
   if (java_result.is_null())
     return false;
 
   base::string16 utf16_result =
       base::android::ConvertJavaStringToUTF16(java_result);
   output->Append(utf16_result.data(), static_cast<int>(utf16_result.size()));
   return true;
 }
 
 }  // namespace url