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

third_party/WebKit/Source/core/loader/DocumentLoadTimingTest.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/loader/DocumentLoadTiming.h"
 
 #include "core/loader/DocumentLoader.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <memory>
 
 namespace blink {
 
-class DocumentLoadTimingTest : public testing::Test {};
+class DocumentLoadTimingTest : public ::testing::Test {};
 
 TEST_F(DocumentLoadTimingTest, ensureValidNavigationStartAfterEmbedder) {
   std::unique_ptr<DummyPageHolder> dummy_page = DummyPageHolder::Create();
   DocumentLoadTiming timing(*(dummy_page->GetDocument().Loader()));
 
   double delta = -1000;
   double embedder_navigation_start = MonotonicallyIncreasingTime() + delta;
   timing.SetNavigationStart(embedder_navigation_start);
 
   double real_wall_time = CurrentTime();
@@ skipping 23 matching lines @@
 
   EXPECT_NEAR(adjusted_load_event_end, real_wall_load_event_end, .001);
 
   double adjusted_navigation_start =
       timing.MonotonicTimeToPseudoWallTime(timing.NavigationStart());
   EXPECT_NEAR(adjusted_load_event_end - adjusted_navigation_start,
               -navigation_start_delta, .001);
 }
 
 }  // namespace blink