[Refactring] Turn HTMLImport::m_sync from bool to an enum.

Source/core/html/imports/HTMLImportsController.cpp

Index: Source/core/html/imports/HTMLImportsController.cpp
diff --git a/Source/core/html/imports/HTMLImportsController.cpp b/Source/core/html/imports/HTMLImportsController.cpp
index 5854b3240b9b0908c7aa4bf970d12b7305d417f0..ae153eb949dc19382c6875a5b827e7c13e19afea 100644
--- a/Source/core/html/imports/HTMLImportsController.cpp
+++ b/Source/core/html/imports/HTMLImportsController.cpp
@@ -71,7 +71,7 @@ void HTMLImportsController::clear()
 
 HTMLImportChild* HTMLImportsController::createChild(const KURL& url, HTMLImport* parent, HTMLImportChildClient* client)
 {
-    OwnPtr<HTMLImportChild> loader = adoptPtr(new HTMLImportChild(*m_master, url, client->isSync()));
+    OwnPtr<HTMLImportChild> loader = adoptPtr(new HTMLImportChild(*m_master, url, client->isSync() ? HTMLImport::Sync : HTMLImport::Async));
     loader->setClient(client);
     parent->appendChild(loader.get());
     m_imports.append(loader.release());