Add missing using declarations in cronet code.

net/base/net_string_util_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 "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "jni/NetStringUtil_jni.h"
 #include "net/base/net_string_util.h"
 
+using base::android::ScopedJavaLocalRef;
+
 namespace net {
 
 namespace {
 
 // Attempts to convert |text| encoded in |charset| to a jstring (Java unicode
 // string).  Returns the result jstring, or NULL on failure.
 ScopedJavaLocalRef<jstring> ConvertToJstring(const std::string& text,
                                              const char* charset) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> java_byte_buffer(
@@ skipping 83 matching lines @@
   output->clear();
   ScopedJavaLocalRef<jstring> java_result =
      ConvertToJstringWithSubstitutions(text, charset);
   if (java_result.is_null())
     return false;
   *output = base::android::ConvertJavaStringToUTF16(java_result);
   return true;
 }
 
 }  // namespace net