Oilpan: Replace checkHeader() with ASSERT(checkHeader())

Source/platform/heap/HeapAllocator.h

Index: Source/platform/heap/HeapAllocator.h
diff --git a/Source/platform/heap/HeapAllocator.h b/Source/platform/heap/HeapAllocator.h
index 92b30ef1169f684c3ce96239ea0cfcbc04c0e366..39a5a0d5d15f0b9537da25308ce070b288850e27 100644
--- a/Source/platform/heap/HeapAllocator.h
+++ b/Source/platform/heap/HeapAllocator.h
@@ -283,7 +283,7 @@ void HeapVectorBacking<T, Traits>::finalize(void* pointer)
 
     ASSERT(!WTF::IsTriviallyDestructible<T>::value);
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(pointer);
-    header->checkHeader();
+    ASSERT(header->checkHeader());
     // Use the payload size as recorded by the heap to determine how many
     // elements to finalize.
     size_t length = header->payloadSize() / sizeof(T);
@@ -317,7 +317,7 @@ void HeapHashTableBacking<Table>::finalize(void* pointer)
     using Value = typename Table::ValueType;
     ASSERT(!WTF::IsTriviallyDestructible<Value>::value);
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(pointer);
-    header->checkHeader();
+    ASSERT(header->checkHeader());
     // Use the payload size as recorded by the heap to determine how many
     // elements to finalize.
     size_t length = header->payloadSize() / sizeof(Value);