Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/scheduler/child/idle_canceled_delayed_task_sweeper_unittest.cc

 // Copyright 2017 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 "platform/scheduler/child/idle_canceled_delayed_task_sweeper.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "platform/scheduler/base/lazy_now.h"
 #include "platform/scheduler/base/task_queue.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/idle_helper.h"
 #include "platform/scheduler/child/scheduler_helper.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 namespace scheduler {
 
 class TestClass {
  public:
   TestClass() : weak_factory_(this) {}
 
   void NopTask() {}
 
   base::WeakPtrFactory<TestClass> weak_factory_;
 };
 
-class IdleCanceledDelayedTaskSweeperTest : public testing::Test,
+class IdleCanceledDelayedTaskSweeperTest : public ::testing::Test,
                                            public IdleHelper::Delegate {
  public:
   IdleCanceledDelayedTaskSweeperTest()
       : clock_(new base::SimpleTestTickClock()),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_.get(), true)),
         delegate_(SchedulerTqmDelegateForTest::Create(
             mock_task_runner_,
             base::WrapUnique(new TestTimeSource(clock_.get())))),
         scheduler_helper_(new SchedulerHelper(delegate_)),
         idle_helper_(new IdleHelper(scheduler_helper_.get(),
@@ skipping 80 matching lines @@
   // canceled tasks would get removed by TaskQueueImpl::WakeUpForDelayedWork.
   clock_->Advance(base::TimeDelta::FromSeconds(40));
   idle_helper_->EnableLongIdlePeriod();
   mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(40));
 
   EXPECT_EQ(1u, default_task_queue_->GetNumberOfPendingTasks());
 }
 
 }  // namespace scheduler
 }  // namespace blink