Remove more dead code after Object.observe removal

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index d22e070b0e51f7856cc47726e40ce3cac30e54bb..39570f28f2c0bdd6ad1abbfd671b24fe816fd96c 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -381,7 +381,6 @@ namespace internal {
   F(ObjectHasOwnProperty, 2, 1)                      \
   F(InternalSetPrototype, 2, 1)                      \
   F(SetPrototype, 2, 1)                              \
-  F(GetOwnProperty_Legacy, 2, 1)                     \
   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
   F(GetProperty, 2, 1)                               \
   F(KeyedGetProperty, 2, 1)                          \
@@ -402,8 +401,6 @@ namespace internal {
   F(AllocateHeapNumber, 0, 1)                        \
   F(NewObject, 2, 1)                                 \
   F(FinalizeInstanceSize, 1, 1)                      \
-  F(GlobalProxy, 1, 1)                               \
-  F(LookupAccessor, 3, 1)                            \
   F(LoadMutableDouble, 2, 1)                         \
   F(TryMigrateInstance, 1, 1)                        \
   F(IsJSGlobalProxy, 1, 1)                           \