Removed apiutils.h and related cleanup.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 5c3bbb34726b33dffc7097d400bd8875840a5237..077d337dda9b6a395b8db6482d6e04a8e3343028 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -30,7 +30,6 @@
 
 #include "../include/v8-debug.h"
 #include "allocation.h"
-#include "apiutils.h"
 #include "assert-scope.h"
 #include "atomicops.h"
 #include "builtins.h"
@@ -886,9 +885,8 @@ class Isolate {
     return descriptor_lookup_cache_;
   }
 
-  v8::ImplementationUtilities::HandleScopeData* handle_scope_data() {
-    return &handle_scope_data_;
-  }
+  HandleScopeData* handle_scope_data() { return &handle_scope_data_; }
+
   HandleScopeImplementer* handle_scope_implementer() {
     ASSERT(handle_scope_implementer_);
     return handle_scope_implementer_;
@@ -1274,7 +1272,7 @@ class Isolate {
   KeyedLookupCache* keyed_lookup_cache_;
   ContextSlotCache* context_slot_cache_;
   DescriptorLookupCache* descriptor_lookup_cache_;
-  v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
+  HandleScopeData handle_scope_data_;
   HandleScopeImplementer* handle_scope_implementer_;
   UnicodeCache* unicode_cache_;
   Zone runtime_zone_;