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

third_party/WebKit/Source/platform/TimerTest.cpp

 // 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/Timer.h"
 
 #include <memory>
 #include <queue>
 #include "base/message_loop/message_loop.h"
 #include "platform/scheduler/base/task_queue_impl.h"
 #include "platform/scheduler/child/web_scheduler.h"
 #include "platform/scheduler/child/web_task_runner_impl.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 #include "platform/scheduler/renderer/web_view_scheduler.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/wtf/CurrentTime.h"
 #include "platform/wtf/PtrUtil.h"
 #include "platform/wtf/RefCounted.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebThread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::ElementsAre;
+using ::testing::ElementsAre;
 
 namespace blink {
 namespace {
 
-class TimerTest : public testing::Test {
+class TimerTest : public ::testing::Test {
  public:
   void SetUp() override {
     run_times_.clear();
     platform_->AdvanceClockSeconds(10.0);
     start_time_ = MonotonicallyIncreasingTime();
   }
 
   void CountingTask(TimerBase*) {
     run_times_.push_back(MonotonicallyIncreasingTime());
   }
@@ skipping 682 matching lines @@
                                 &TimerTest::CountingTask);
 
   platform_->RunUntilIdle();
   EXPECT_TRUE(!run_times_.size());
   EXPECT_TRUE(task_runner1->IsEmpty());
   EXPECT_TRUE(task_runner2->IsEmpty());
 }
 
 }  // namespace
 }  // namespace blink