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

third_party/WebKit/Source/core/exported/WebNodeTest.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 "public/web/WebNode.h"
 
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/testing/DummyPageHolder.h"
 #include "public/web/WebElement.h"
 #include "public/web/WebElementCollection.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class WebNodeTest : public testing::Test {
+class WebNodeTest : public ::testing::Test {
  protected:
   Document& GetDocument() { return page_holder_->GetDocument(); }
 
   void SetInnerHTML(const String& html) {
     GetDocument().documentElement()->setInnerHTML(html);
   }
 
   WebNode Root() { return WebNode(GetDocument().documentElement()); }
 
  private:
@@ skipping 32 matching lines @@
   // WebNode::getElementsByHTMLTagName returns only HTML elements.
   WebElementCollection collection = Root().GetElementsByHTMLTagName("label");
   EXPECT_EQ(1u, collection.length());
   EXPECT_TRUE(collection.FirstItem().HasHTMLTagName("label"));
   // The argument should be lower-case.
   collection = Root().GetElementsByHTMLTagName("LABEL");
   EXPECT_EQ(0u, collection.length());
 }
 
 }  // namespace blink