Make serializer non-static.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b296b9372379bf8bcfc91809d7750d0d9207c03d..981b61d8f1bca0406a514cd62ac17d140ed9f9da 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -8033,7 +8033,7 @@ bool HOptimizedGraphBuilder::TryInlineApiCall(Handle<JSFunction> function,
   if (call_type == kCallApiFunction) {
     // Cannot embed a direct reference to the global proxy map
     // as it maybe dropped on deserialization.
-    CHECK(!Serializer::enabled(isolate()));
+    CHECK(!isolate()->serializer_enabled());
     ASSERT_EQ(0, receiver_maps->length());
     receiver_maps->Add(handle(
         function->context()->global_object()->global_receiver()->map()),
@@ -8220,7 +8220,7 @@ HValue* HOptimizedGraphBuilder::ImplicitReceiverFor(HValue* function,
   if (shared->strict_mode() == SLOPPY && !shared->native()) {
     // Cannot embed a direct reference to the global proxy
     // as is it dropped on deserialization.
-    CHECK(!Serializer::enabled(isolate()));
+    CHECK(!isolate()->serializer_enabled());
     Handle<JSObject> global_receiver(
         target->context()->global_object()->global_receiver());
     return Add<HConstant>(global_receiver);