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

third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler_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/worker_global_scope_scheduler.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/test/test_simple_task_runner.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "platform/scheduler/child/worker_scheduler_impl.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::ElementsAreArray;
+using ::testing::ElementsAreArray;
 
 namespace blink {
 namespace scheduler {
 
 namespace {
 
 void AppendToVectorTestTask(std::vector<std::string>* vector,
                             std::string value) {
   vector->push_back(value);
 }
 
 }  // namespace
 
-class WorkerGlobalScopeSchedulerTest : public testing::Test {
+class WorkerGlobalScopeSchedulerTest : public ::testing::Test {
  public:
   WorkerGlobalScopeSchedulerTest()
       : clock_(new base::SimpleTestTickClock()),
         mock_task_runner_(new base::TestSimpleTaskRunner()),
         main_task_runner_(SchedulerTqmDelegateForTest::Create(
             mock_task_runner_,
             base::WrapUnique(new TestTimeSource(clock_.get())))),
         scheduler_(new WorkerSchedulerImpl(main_task_runner_)) {
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
   }
@@ skipping 27 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(WorkerGlobalScopeSchedulerTest);
 };
 
 TEST_F(WorkerGlobalScopeSchedulerTest, TestPostTasks) {
   std::vector<std::string> run_order;
   PostTestTask(&run_order, "T1");
   PostTestTask(&run_order, "T2");
   RunUntilIdle();
   PostTestTask(&run_order, "T3");
   RunUntilIdle();
-  EXPECT_THAT(run_order, testing::ElementsAre("T1", "T2", "T3"));
+  EXPECT_THAT(run_order, ::testing::ElementsAre("T1", "T2", "T3"));
 
   // Tasks should not run after the scheduler is disposed of.
   global_scope_scheduler_->Dispose();
   run_order.clear();
   PostTestTask(&run_order, "T4");
   PostTestTask(&run_order, "T5");
   RunUntilIdle();
   EXPECT_TRUE(run_order.empty());
 }
 
 }  // namespace scheduler
 }  // namespace blink