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

third_party/WebKit/Source/core/css/threaded/MultiThreadedTestUtil.h

 // 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.
 
 #ifndef MultiThreadedTestUtil_h
 #define MultiThreadedTestUtil_h
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "platform/CrossThreadFunctional.h"
 #include "platform/WaitableEvent.h"
 #include "platform/WebTaskRunner.h"
 #include "platform/WebThreadSupportingGC.h"
 #include "platform/scheduler/child/web_scheduler.h"
 #include "platform/wtf/Functional.h"
 #include "platform/wtf/RefCounted.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebThread.h"
 
 namespace blink {
 
 // This creates 2 macros for TSAN: TSAN_TEST and TSAN_TEST_F.
 // Those tests are automatically disabled on non-tsan builds and should be used
 // instead of the normal gtest macros for MultiThreadedTests.
 // It guarantees that those tests are only run on Thread Sanitizer enabled
 // builds.
-// Also, TSAN_TEST subclasses MultiThreadTest instead of testing::Test.
+// Also, TSAN_TEST subclasses MultiThreadTest instead of ::testing::Test.
 #if defined(THREAD_SANITIZER)
 
 #define TSAN_TEST(test_case_name, test_name)                         \
   GTEST_TEST_(test_case_name, test_name, ::blink::MultiThreadedTest, \
               ::testing::internal::GetTypeId<::blink::MultiThreadedTest>())
 
 #define TSAN_TEST_F(test_fixture, test_name) TEST_F(test_fixture, test_name)
 
 #else
 
 #define TSAN_TEST(test_case_name, test_name)        \
   GTEST_TEST_(test_case_name, DISABLED_##test_name, \
               ::blink::MultiThreadedTest,           \
               ::testing::internal::GetTypeId<::blink::MultiThreadedTest>())
 
 #define TSAN_TEST_F(test_fixture, test_name) \
   TEST_F(test_fixture, DISABLED_##test_name)
 
 #endif
 
-class MultiThreadedTest : public testing::Test {
+class MultiThreadedTest : public ::testing::Test {
  public:
   // RunOnThreads run a closure num_threads * callbacks_per_thread times.
   // The default for this is 10*100 = 1000 times.
   template <typename FunctionType, typename... Ps>
   void RunOnThreads(FunctionType function, Ps&&... parameters) {
     Vector<std::unique_ptr<WebThreadSupportingGC>> threads;
     Vector<std::unique_ptr<WaitableEvent>> waits;
 
     for (int i = 0; i < num_threads_; ++i) {
       threads.push_back(WebThreadSupportingGC::Create(""));
@@ skipping 31 matching lines @@
   }
 
  protected:
   int num_threads_ = 10;
   int callbacks_per_thread_ = 100;
 };
 
 }  // namespace blink
 
 #endif  // MultiThreadedTestUtil_h