Remove call to GetBlockingPool in RLZ

chrome/browser/rlz/chrome_rlz_tracker_delegate_unittest.cc

 // Copyright (c) 2012 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/rlz/chrome_rlz_tracker_delegate.h"
 
 #include <memory>
 
+#include "base/test/scoped_task_environment.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::NavigationEntry;
 using content::LoadCommittedDetails;
 
 class ChromeRLZTrackerDelegateTest : public testing::Test {
  public:
   ChromeRLZTrackerDelegateTest() : delegate_(new ChromeRLZTrackerDelegate) {}
   ~ChromeRLZTrackerDelegateTest() override {}
 
   void SendNotification(int type,
                         const content::NotificationSource& source,
                         const content::NotificationDetails& details) {
     content::NotificationObserver* observer = delegate_.get();
     observer->Observe(type, source, details);
   }
 
  private:
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<ChromeRLZTrackerDelegate> delegate_;
 };
 
 TEST_F(ChromeRLZTrackerDelegateTest, ObserveHandlesBadArgs) {
   std::unique_ptr<content::LoadCommittedDetails> details(
       new content::LoadCommittedDetails());
   std::unique_ptr<content::NavigationEntry> entry(
       content::NavigationEntry::Create());
   details->entry = entry.get();
   details->entry->SetTransitionType(ui::PAGE_TRANSITION_LINK);
   SendNotification(content::NOTIFICATION_NAV_ENTRY_COMMITTED,
                    content::NotificationService::AllSources(),
                    content::Details<NavigationEntry>(nullptr));
   SendNotification(content::NOTIFICATION_NAV_ENTRY_COMMITTED,
                    content::NotificationService::AllSources(),
                    content::Details<LoadCommittedDetails>(details.get()));
 }