Make GetApplicationContext return a JavaRef.

components/invalidation/impl/invalidation_service_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 "components/invalidation/impl/invalidation_service_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/callback.h"
 #include "components/invalidation/public/object_id_invalidation_map.h"
 #include "google/cacheinvalidation/types.pb.h"
 #include "jni/InvalidationService_jni.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
+using base::android::JavaRef;
 using base::android::JavaParamRef;
 
 namespace invalidation {
 
-InvalidationServiceAndroid::InvalidationServiceAndroid(jobject context)
-    : invalidator_state_(syncer::INVALIDATIONS_ENABLED),
-      logger_() {
+InvalidationServiceAndroid::InvalidationServiceAndroid(
+    const JavaRef<jobject>& context)
+    : invalidator_state_(syncer::INVALIDATIONS_ENABLED), logger_() {
   DCHECK(CalledOnValidThread());
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jobject> local_java_ref =
       Java_InvalidationService_create(env,
           context,
           reinterpret_cast<intptr_t>(this));
   java_ref_.Reset(env, local_java_ref.obj());
   logger_.OnStateChange(invalidator_state_);
 }
 
@@ skipping 135 matching lines @@
       object_invalidation_map);
   logger_.OnInvalidation(object_invalidation_map);
 }
 
 // static
 bool InvalidationServiceAndroid::RegisterJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace invalidation