Rolling back r10049 due to webkit failures.

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index d0a1a639f355d88797e3f796a9d424767d2754aa..e3a84c8c9d3b42e3c18fd87e07a62ed41464af18 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -669,14 +669,6 @@ void Deserializer::Deserialize() {
 
   isolate_->heap()->set_global_contexts_list(
       isolate_->heap()->undefined_value());
-
-  // Update data pointers to the external strings containing natives sources.
-  for (int i = 0; i < Natives::GetBuiltinsCount(); i++) {
-    Object* source = isolate_->heap()->natives_source_cache()->get(i);
-    if (!source->IsUndefined()) {
-      ExternalAsciiString::cast(source)->update_data_cache();
-    }
-  }
 }
 
 
@@ -1572,6 +1564,7 @@ void Serializer::ObjectSerializer::VisitExternalAsciiString(
         sink_->Put(kNativesStringResource, "NativesStringResource");
         sink_->PutSection(i, "NativesStringResourceEnd");
         bytes_processed_so_far_ += sizeof(resource);
+        string->clear_data_cache();
         return;
       }
     }