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

third_party/WebKit/Source/core/html/media/AutoplayUmaHelperTest.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/media/AutoplayUmaHelper.h"
 
 #include "core/dom/Document.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/media/AutoplayPolicy.h"
@@ skipping 18 matching lines @@
   void HandlePlayingEvent() { AutoplayUmaHelper::HandlePlayingEvent(); }
 
   MOCK_METHOD0(HandleContextDestroyed, void());
 
   // Making this a wrapper function to avoid calling the mocked version.
   void ReallyHandleContextDestroyed() {
     AutoplayUmaHelper::HandleContextDestroyed();
   }
 };
 
-class AutoplayUmaHelperTest : public testing::Test {
+class AutoplayUmaHelperTest : public ::testing::Test {
  protected:
   Document& GetDocument() { return page_holder_->GetDocument(); }
 
   HTMLMediaElement& MediaElement() {
     Element* element = GetDocument().getElementById("video");
     DCHECK(element);
     return toHTMLVideoElement(*element);
   }
 
   MockAutoplayUmaHelper& UmaHelper() { return *uma_helper_; }
@@ skipping 21 matching lines @@
   EXPECT_CALL(UmaHelper(), HandleContextDestroyed());
 
   MediaElement().setMuted(true);
   UmaHelper().OnAutoplayInitiated(AutoplaySource::kMethod);
   UmaHelper().HandlePlayingEvent();
   PageHolder().reset();
   ::testing::Mock::VerifyAndClear(&UmaHelper());
 }
 
 }  // namespace blink