Make serializer non-static.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index f7605d8d21b346e85a78c557aca0b74d78cb624c..7a5e4438188eb07ac1322c704697c4a80cc69838 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1457,6 +1457,7 @@ Isolate::Isolate()
       // TODO(bmeurer) Initialized lazily because it depends on flags; can
       // be fixed once the default isolate cleanup is done.
       random_number_generator_(NULL),
+      serializer_enabled_(false),
       has_fatal_error_(false),
       use_crankshaft_(true),
       initialized_from_snapshot_(false),
@@ -1776,9 +1777,7 @@ bool Isolate::Init(Deserializer* des) {
 
   has_fatal_error_ = false;
 
-  use_crankshaft_ = FLAG_crankshaft
-      && !Serializer::enabled(this)
-      && CpuFeatures::SupportsCrankshaft();
+  use_crankshaft_ = FLAG_crankshaft && CpuFeatures::SupportsCrankshaft();
 
   if (function_entry_hook() != NULL) {
     // When function entry hooking is in effect, we have to create the code
@@ -1965,7 +1964,7 @@ bool Isolate::Init(Deserializer* des) {
         kDeoptTableSerializeEntryCount - 1);
   }
 
-  if (!Serializer::enabled(this)) {
+  if (!serializer_enabled()) {
     // Ensure that all stubs which need to be generated ahead of time, but
     // cannot be serialized into the snapshot have been generated.
     HandleScope scope(this);