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

third_party/WebKit/Source/core/page/FocusControllerTest.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/page/FocusController.h"
 
 #include <memory>
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "core/dom/ShadowRootInit.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class FocusControllerTest : public testing::Test {
+class FocusControllerTest : public ::testing::Test {
  public:
   Document& GetDocument() const { return page_holder_->GetDocument(); }
   FocusController& GetFocusController() const {
     return GetDocument().GetPage()->GetFocusController();
   }
   DummyPageHolder* PageHolder() const { return page_holder_.get(); }
 
  private:
   void SetUp() override { page_holder_ = DummyPageHolder::Create(); }
 
@@ skipping 61 matching lines @@
 TEST_F(FocusControllerTest, SetActiveOnInactiveDocument) {
   // Test for crbug.com/700334
   GetDocument().Shutdown();
   // Document::shutdown() detaches document from its frame, and thus
   // document().page() becomes nullptr.
   // Use DummyPageHolder's page to retrieve FocusController.
   PageHolder()->GetPage().GetFocusController().SetActive(true);
 }
 
 }  // namespace blink