[oilpan] Fix iterators over member collections to return Result<T>

Source/heap/tests/HeapTest.cpp

Index: Source/heap/tests/HeapTest.cpp
diff --git a/Source/heap/tests/HeapTest.cpp b/Source/heap/tests/HeapTest.cpp
index 6c051ca46ceb52e870279adf03d2573b80a67c38..fcd2102d4fc3b99029fbbfdd73273d47d6fa24f4 100644
--- a/Source/heap/tests/HeapTest.cpp
+++ b/Source/heap/tests/HeapTest.cpp
@@ -1146,15 +1146,18 @@ void HeapTester::hashSetMembers()
         EXPECT_TRUE(afterAdding1000.totalObjectSpace() > afterGC2.totalObjectSpace());
 
         EXPECT_EQ(set->size(), 1000);
-        int i = 0, ninetyNines = 0;
+        int i = 0, ninetyNines = 0, threeSixties = 0;
         for (HeapSet::iterator it(set->begin(&set)), end(set->end(&set)); it != end; ++it) {
             HandleScope forScope;
-            if (Handle<IntWrapper>(*it.get())->value() == 99)
+            if (it.get()->value() == 99)
                 ninetyNines++;
+            if (it->value() == 360)
+                threeSixties++;
             i++;
         }
         EXPECT_EQ(i, 1000);
         EXPECT_EQ(ninetyNines, 1);
+        EXPECT_EQ(threeSixties, 1);
 
         // Equality is by underlying pointer, so there are two different
         // IntWrappers in there now that contain '1'. We add one of them