Notify DataUseTabModel of navigations and tab closures

chrome/browser/android/data_usage/external_data_use_observer.cc

 // Copyright 2015 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/data_usage/external_data_use_observer.h"
 
 #include <utility>
 
 #include "base/android/jni_string.h"
 #include "base/containers/hash_tables.h"
@@ skipping 87 matching lines @@
       base::Bind(&ExternalDataUseObserver::CreateJavaObjectOnUIThread,
                  GetUIWeakPtr()));
 
   ui_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&ExternalDataUseObserver::FetchMatchingRulesOnUIThread,
                  GetUIWeakPtr()));
 
   // |this| owns and must outlive the |data_use_tab_model_|.
   data_use_tab_model_.reset(new DataUseTabModel(this, ui_task_runner_));
+  data_use_tab_model_weak_ptr_ = data_use_tab_model_->GetWeakPtr();
 
   matching_rules_fetch_pending_ = true;
   data_use_aggregator_->AddObserver(this);
   registered_as_observer_ = true;
 }
 
 void ExternalDataUseObserver::CreateJavaObjectOnUIThread() {
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
   JNIEnv* env = base::android::AttachCurrentThread();
   j_external_data_use_observer_.Reset(Java_ExternalDataUseObserver_create(
@@ skipping 359 matching lines @@
   return label_;
 }
 
 bool RegisterExternalDataUseObserver(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 
 }  // namespace chrome