jni: Pass method parameters as JavaParamRef in content.

content/browser/android/date_time_chooser_android.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_ANDROID_DATE_TIME_CHOOSER_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_DATE_TIME_CHOOSER_ANDROID_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 20 matching lines @@
   void ShowDialog(gfx::NativeWindow native_window,
                   RenderViewHost* host,
                   ui::TextInputType dialog_type,
                   double dialog_value,
                   double min,
                   double max,
                   double step,
                   const std::vector<DateTimeSuggestion>& suggestions);
 
   // Replaces the current value
-  void ReplaceDateTime(JNIEnv* env, jobject, jdouble value);
+  void ReplaceDateTime(JNIEnv* env,
+                       const base::android::JavaRef<jobject>&,
+                       jdouble value);
 
   // Closes the dialog without propagating any changes.
-  void CancelDialog(JNIEnv* env, jobject);
+  void CancelDialog(JNIEnv* env, const base::android::JavaRef<jobject>&);
 
  private:
   RenderViewHost* host_;
 
   base::android::ScopedJavaGlobalRef<jobject> j_date_time_chooser_;
 
   DISALLOW_COPY_AND_ASSIGN(DateTimeChooserAndroid);
 };
 
 // Native JNI methods
 bool RegisterDateTimeChooserAndroid(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_DATE_TIME_CHOOSER_ANDROID_H_