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

third_party/WebKit/Source/modules/accessibility/AXObjectTest.cpp

 // Copyright 2014 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 "modules/accessibility/AXObject.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <memory>
 
 namespace blink {
 
-class AXObjectTest : public testing::Test {
+class AXObjectTest : public ::testing::Test {
  protected:
   Document& GetDocument() { return page_holder_->GetDocument(); }
 
  private:
   void SetUp() override;
 
   std::unique_ptr<DummyPageHolder> page_holder_;
 };
 
 void AXObjectTest::SetUp() {
@@ skipping 38 matching lines @@
       *root->getElementById("aria-selected")));
   EXPECT_TRUE(AXObjectCache::IsInsideFocusableElementOrARIAWidget(
       *root->getElementById("haspopup")));
   EXPECT_TRUE(AXObjectCache::IsInsideFocusableElementOrARIAWidget(
       *root->getElementById("focusable")));
   EXPECT_TRUE(AXObjectCache::IsInsideFocusableElementOrARIAWidget(
       *root->getElementById("focusable-parent")));
 }
 
 }  // namespace blink