Follow-up fix for leaking mock object in AutoplayUmaHelperTest

third_party/WebKit/Source/core/html/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/AutoplayUmaHelper.h"
 
 #include "core/dom/Document.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/testing/DummyPageHolder.h"
@@ skipping 39 matching lines @@
   std::unique_ptr<DummyPageHolder>& pageHolder() { return m_pageHolder; }
 
  private:
   void SetUp() override {
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
     document().documentElement()->setInnerHTML("<video id=video></video>",
                                                ASSERT_NO_EXCEPTION);
     HTMLMediaElement& element = mediaElement();
     m_umaHelper = new MockAutoplayUmaHelper(&element);
     element.m_autoplayUmaHelper = m_umaHelper;
+    ::testing::Mock::AllowLeak(&umaHelper());
   }
 
   void TearDown() override { m_umaHelper.clear(); }
 
   std::unique_ptr<DummyPageHolder> m_pageHolder;
   Persistent<MockAutoplayUmaHelper> m_umaHelper;
 };
 
 TEST_F(AutoplayUmaHelperTest, VisibilityChangeWhenUnload) {
   EXPECT_CALL(umaHelper(), handleContextDestroyed());
 
   mediaElement().setMuted(true);
   umaHelper().onAutoplayInitiated(AutoplaySource::Attribute);
   umaHelper().handlePlayingEvent();
   pageHolder().reset();
   ::testing::Mock::VerifyAndClear(&umaHelper());
 }
 
 }  // namespace blink