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

third_party/WebKit/Source/core/dom/IdleDeadlineTest.cpp

 // Copyright 2016 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 "core/dom/IdleDeadline.h"
 
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/wtf/CurrentTime.h"
 #include "public/platform/Platform.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 50 matching lines @@
   ~MockPlatform() override {}
   WebThread* CurrentThread() override { return &thread_; }
 
  private:
   MockThread thread_;
   DISALLOW_COPY_AND_ASSIGN(MockPlatform);
 };
 
 }  // namespace
 
-class IdleDeadlineTest : public testing::Test {
+class IdleDeadlineTest : public ::testing::Test {
  public:
   void SetUp() override {
     original_time_function_ = SetTimeFunctionsForTesting([] { return 1.0; });
   }
 
   void TearDown() override {
     SetTimeFunctionsForTesting(original_time_function_);
   }
 
  private:
@@ skipping 15 matching lines @@
 
 TEST_F(IdleDeadlineTest, yieldForHighPriorityWork) {
   ScopedTestingPlatformSupport<MockPlatform> platform;
 
   IdleDeadline* deadline =
       IdleDeadline::Create(1.25, IdleDeadline::CallbackType::kCalledWhenIdle);
   EXPECT_FLOAT_EQ(0, deadline->timeRemaining());
 }
 
 }  // namespace blink