Remove more dead code after Object.observe removal

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index e01f95916db794b8251576bf6ff8183f93f808bc..3922c7351a2706f6524677a94495b5de484784cd 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -126,8 +126,12 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
                                                                \
   V(ObjectAssign, kNone)                                       \
   V(ObjectCreate, kNone)                                       \
+  V(ObjectDefineGetter, kNone)                                 \
+  V(ObjectDefineSetter, kNone)                                 \
+  V(ObjectEntries, kNone)                                      \
   V(ObjectFreeze, kNone)                                       \
   V(ObjectGetOwnPropertyDescriptor, kNone)                     \
+  V(ObjectGetOwnPropertyDescriptors, kNone)                    \
   V(ObjectGetOwnPropertyNames, kNone)                          \
   V(ObjectGetOwnPropertySymbols, kNone)                        \
   V(ObjectIs, kNone)                                           \
@@ -135,12 +139,12 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(ObjectIsFrozen, kNone)                                     \
   V(ObjectIsSealed, kNone)                                     \
   V(ObjectKeys, kNone)                                         \
-  V(ObjectValues, kNone)                                       \
-  V(ObjectEntries, kNone)                                      \
-  V(ObjectGetOwnPropertyDescriptors, kNone)                    \
+  V(ObjectLookupGetter, kNone)                                 \
+  V(ObjectLookupSetter, kNone)                                 \
   V(ObjectPreventExtensions, kNone)                            \
-  V(ObjectSeal, kNone)                                         \
   V(ObjectProtoToString, kNone)                                \
+  V(ObjectSeal, kNone)                                         \
+  V(ObjectValues, kNone)                                       \
                                                                \
   V(ProxyConstructor, kNone)                                   \
   V(ProxyConstructor_ConstructStub, kTarget)                   \