Remove JSBuiltinsObject.

src/contexts.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/contexts.h"
 
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
 #include "src/scopeinfo.h"
@@ skipping 100 matching lines @@
   return ScopeInfo::cast(object);
 }
 
 
 String* Context::catch_name() {
   DCHECK(IsCatchContext());
   return String::cast(extension());
 }
 
 
-JSBuiltinsObject* Context::builtins() {
-  GlobalObject* object = global_object();
-  if (object->IsJSGlobalObject()) {
-    return JSGlobalObject::cast(object)->builtins();
-  } else {
-    DCHECK(object->IsJSBuiltinsObject());
-    return JSBuiltinsObject::cast(object);
-  }
-}
-
-
 Context* Context::script_context() {
   Context* current = this;
   while (!current->IsScriptContext()) {
     current = current->previous();
   }
   return current;
 }
 
 
 Context* Context::native_context() {
@@ skipping 442 matching lines @@
   // During bootstrapping we allow all objects to pass as global
   // objects. This is necessary to fix circular dependencies.
   return isolate->heap()->gc_state() != Heap::NOT_IN_GC ||
       isolate->bootstrapper()->IsActive() ||
       object->IsGlobalObject();
 }
 #endif
 
 }  // namespace internal
 }  // namespace v8