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

third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl_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/web_view_scheduler_impl.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/field_trial_param_associator.h"
 #include "base/metrics/field_trial_params.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "platform/WebTaskRunner.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 #include "platform/scheduler/renderer/web_frame_scheduler_impl.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 #include "public/platform/WebTraceLocation.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::ElementsAre;
+using ::testing::ElementsAre;
 using VirtualTimePolicy = blink::WebViewScheduler::VirtualTimePolicy;
 
 namespace blink {
 namespace scheduler {
 
-class WebViewSchedulerImplTest : public testing::Test {
+class WebViewSchedulerImplTest : public ::testing::Test {
  public:
   WebViewSchedulerImplTest() {}
   ~WebViewSchedulerImplTest() override {}
 
   void SetUp() override {
     clock_.reset(new base::SimpleTestTickClock());
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     mock_task_runner_ =
         make_scoped_refptr(new cc::OrderedSimpleTaskRunner(clock_.get(), true));
     delegate_ = SchedulerTqmDelegateForTest::Create(
@@ skipping 854 matching lines @@
       run_times,
       ElementsAre(base::TimeTicks() + base::TimeDelta::FromSeconds(84),
                   base::TimeTicks() + base::TimeDelta::FromSeconds(109),
                   base::TimeTicks() + base::TimeDelta::FromSeconds(134)));
 
   base::FieldTrialParamAssociator::GetInstance()->ClearAllParamsForTesting();
 }
 
 }  // namespace scheduler
 }  // namespace blink