Add missing using statements for JNI types.

chrome/browser/android/accessibility/font_size_prefs_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 "chrome/browser/android/accessibility/font_size_prefs_android.h"
 
 #include "base/observer_list.h"
 #include "chrome/browser/profiles/profile_android.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_service.h"
 #include "jni/FontSizePrefs_jni.h"
 
+using base::android::JavaParamRef;
 using base::android::JavaRef;
 
 FontSizePrefsAndroid::FontSizePrefsAndroid(JNIEnv* env, jobject obj)
     : pref_service_(ProfileManager::GetActiveUserProfile()->GetPrefs()) {
   java_ref_.Reset(env, obj);
   pref_change_registrar_.reset(new PrefChangeRegistrar);
   pref_change_registrar_->Init(pref_service_);
   pref_change_registrar_->Add(
       prefs::kWebKitFontScaleFactor,
       base::Bind(&FontSizePrefsAndroid::OnFontScaleFactorChanged,
@@ skipping 47 matching lines @@
   JNIEnv* env = base::android::AttachCurrentThread();
   float factor = GetFontScaleFactor(env, java_ref_);
   Java_FontSizePrefs_onFontScaleFactorChanged(env, java_ref_.obj(), factor);
 }
 
 void FontSizePrefsAndroid::OnForceEnableZoomChanged() {
   JNIEnv* env = base::android::AttachCurrentThread();
   bool enabled = GetForceEnableZoom(env, java_ref_);
   Java_FontSizePrefs_onForceEnableZoomChanged(env, java_ref_.obj(), enabled);
 }