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

third_party/WebKit/Source/core/html/HTMLEmbedElementTest.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/html/HTMLEmbedElement.h"
 
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/html/HTMLObjectElement.h"
 #include "core/style/ComputedStyle.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class HTMLEmbedElementTest : public testing::Test {
+class HTMLEmbedElementTest : public ::testing::Test {
  protected:
   HTMLEmbedElementTest() {}
 
   void SetUp() override;
 
   Document& GetDocument() const { return *document_; }
 
   void SetHtmlInnerHTML(const char* html_content);
 
   std::unique_ptr<DummyPageHolder> dummy_page_holder_;
@@ skipping 54 matching lines @@
   EXPECT_TRUE(object->HasFallbackContent());
   EXPECT_TRUE(object->UseFallbackContent());
   EXPECT_TRUE(object->WillUseFallbackContentAtLayout());
 
   GetDocument().View()->UpdateAllLifecyclePhases();
   EXPECT_TRUE(static_cast<Element*>(embed)->LayoutObjectIsNeeded(
       ComputedStyle::InitialStyle()));
 }
 
 }  // namespace blink