Fix use-after-scope bug in IntrusiveHeapTest.HeapIndex.

third_party/WebKit/Source/platform/scheduler/base/intrusive_heap_unittest.cc

 // 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 "platform/scheduler/base/intrusive_heap.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 namespace scheduler {
@@ skipping 86 matching lines @@
   IntrusiveHeap<TestElement> heap;
 
   for (int i = 0; i < 50; i++)
     heap.insert({50 - i, nullptr});
 
   EXPECT_EQ(1, heap.min().key);
   EXPECT_EQ(50u, heap.size());
 }
 
 TEST(IntrusiveHeapTest, HeapIndex) {
-  IntrusiveHeap<TestElement> heap;
   HeapHandle index5;
   HeapHandle index4;
   HeapHandle index3;
   HeapHandle index2;
   HeapHandle index1;
+  IntrusiveHeap<TestElement> heap;
 
   EXPECT_FALSE(index1.IsValid());
   EXPECT_FALSE(index2.IsValid());
   EXPECT_FALSE(index3.IsValid());
   EXPECT_FALSE(index4.IsValid());
   EXPECT_FALSE(index5.IsValid());
 
   heap.insert({15, &index5});
   heap.insert({14, &index4});
   heap.insert({13, &index3});
@@ skipping 227 matching lines @@
       DCHECK(heap.min().key == j || (heap.min().key % 2) == 0);
       DCHECK_NE(heap.min().key, 80);
       prev = heap.min().key;
       heap.pop();
     }
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink