Use enum for per thread heap enabled flag

third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp b/third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp
index 608eb1393db1c757a6e93c979c359658552494e9..161a99d242e0fa17f131ae1e9d0349965aa29982 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLParserThread.cpp
@@ -89,7 +89,7 @@ void HTMLParserThread::postTask(std::unique_ptr<CrossThreadClosure> closure)
 {
     ASSERT(isMainThread());
     if (!m_thread) {
-        m_thread = WebThreadSupportingGC::create("HTMLParserThread");
+        m_thread = WebThreadSupportingGC::create("HTMLParserThread", BlinkGC::MainThreadHeapMode);
         postTask(crossThreadBind(&HTMLParserThread::setupHTMLParserThread, crossThreadUnretained(this)));
     }