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

third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler_unittest.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 "platform/scheduler/renderer/task_queue_throttler.h"
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.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/real_time_domain.h"
 #include "platform/scheduler/base/task_queue_impl.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "platform/scheduler/renderer/auto_advancing_virtual_time_domain.h"
 #include "platform/scheduler/renderer/budget_pool.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 #include "platform/scheduler/renderer/web_frame_scheduler_impl.h"
 #include "platform/scheduler/renderer/web_view_scheduler_impl.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::ElementsAre;
+using ::testing::ElementsAre;
 
 namespace {
 bool MessageLoopTaskCounter(size_t* count) {
   *count = *count + 1;
   return true;
 }
 
 void NopTask() {}
 
 void AddOneTask(size_t* count) {
@@ skipping 39 matching lines @@
   base::TimeTicks GetNowTicksWithoutAdvancing() {
     return SimpleTestTickClock::NowTicks();
   }
 
  private:
   base::TimeDelta advancing_interval_;
 };
 
 }  // namespace
 
-class TaskQueueThrottlerTest : public testing::Test {
+class TaskQueueThrottlerTest : public ::testing::Test {
  public:
   TaskQueueThrottlerTest() {}
   ~TaskQueueThrottlerTest() override {}
 
   void SetUp() override {
     clock_ = CreateClock();
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     mock_task_runner_ =
         make_scoped_refptr(new cc::OrderedSimpleTaskRunner(clock_.get(), true));
     delegate_ = SchedulerTqmDelegateForTest::Create(
@@ skipping 1168 matching lines @@
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(2000),
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(2003),
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(2006),
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(2009),
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(3000),
                   base::TimeTicks() + base::TimeDelta::FromMilliseconds(3003)));
 }
 
 }  // namespace scheduler
 }  // namespace blink