Change the return type of WTF::bind() to |OwnPtr<Function>|

Source/platform/heap/HeapTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 4284 matching lines @@
 {
     Persistent<HeapHashMap<int, WeakMember<IntWrapper> > > map = new HeapHashMap<int, WeakMember<IntWrapper> >();
     addElementsToWeakMap(map);
     HeapHashMap<int, WeakMember<IntWrapper> >::AddResult result = map->add(800, nullptr);
     Heap::collectGarbage(ThreadState::HeapPointersOnStack);
     result.storedValue->value = IntWrapper::create(42);
 }
 
 TEST(HeapTest, Bind)
 {
-    Closure closure = bind(&Bar::trace, Bar::create(), static_cast<Visitor*>(0));
+    OwnPtr<Closure> closure = bind(&Bar::trace, Bar::create(), static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the Bar.
     EXPECT_EQ(1u, Bar::s_live);
 
-    Closure closure2 = bind(&Bar::trace, RawPtr<Bar>(Bar::create()), static_cast<Visitor*>(0));
+    OwnPtr<Closure> closure2 = bind(&Bar::trace, RawPtr<Bar>(Bar::create()), static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the Bar.
     EXPECT_EQ(2u, Bar::s_live);
     // RawPtr<OffHeapInt> should not make Persistent.
-    Closure closure3 = bind(&OffHeapInt::voidFunction, RawPtr<OffHeapInt>(OffHeapInt::create(1).get()));
+    OwnPtr<Closure> closure3 = bind(&OffHeapInt::voidFunction, RawPtr<OffHeapInt>(OffHeapInt::create(1).get()));
 
     UseMixin::s_traceCount = 0;
     Mixin* mixin = UseMixin::create();
-    Closure mixinClosure = bind(&Mixin::trace, mixin, static_cast<Visitor*>(0));
+    OwnPtr<Closure> mixinClosure = bind(&Mixin::trace, mixin, static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the mixin.
     EXPECT_EQ(1, UseMixin::s_traceCount);
 }
 
 typedef HeapHashSet<WeakMember<IntWrapper> > WeakSet;
 
 // These special traits will remove a set from a map when the set is empty.
 struct EmptyClearingHashSetTraits : HashTraits<WeakSet> {
     static const WTF::WeakHandlingFlag weakHandlingFlag = WTF::WeakHandlingInCollections;
@@ skipping 1060 matching lines @@
 TEST(HeapTest, NonNodeAllocatingNodeInDestructor)
 {
     new NonNodeAllocatingNodeInDestructor();
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     EXPECT_EQ(10, (*NonNodeAllocatingNodeInDestructor::s_node)->value());
     delete NonNodeAllocatingNodeInDestructor::s_node;
     NonNodeAllocatingNodeInDestructor::s_node = 0;
 }
 
 } // namespace blink