Make TestRLZTrackerDelegate's SequencedWorkerPool multi-threaded.

components/rlz/rlz_tracker_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 "components/rlz/rlz_tracker.h"
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 16 matching lines @@
 using testing::AssertionResult;
 using testing::AssertionSuccess;
 using testing::AssertionFailure;
 
 namespace rlz {
 namespace {
 
 class TestRLZTrackerDelegate : public RLZTrackerDelegate {
  public:
   TestRLZTrackerDelegate()
-      : worker_pool_owner_(1, "TestRLZTracker"),
+      : worker_pool_owner_(2, "TestRLZTracker"),
         request_context_getter_(new net::TestURLRequestContextGetter(
             base::ThreadTaskRunnerHandle::Get())) {}
 
   void set_brand(const char* brand) { brand_override_ = brand; }
 
   void set_reactivation_brand(const char* reactivation_brand) {
     // TODO(thakis): Reactivation doesn't exist on Mac yet.
     reactivation_brand_override_ = reactivation_brand;
   }
 
@@ skipping 954 matching lines @@
 
   ExpectEventRecorded(OmniboxFirstSearch(), true);
 
   RLZTracker::ClearRlzState();
 
   ExpectEventRecorded(OmniboxFirstSearch(), false);
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace rlz