Remove support for Object.observe

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 154 matching lines @@
   T(NotSharedTypedArray, "% is not a shared typed array.")                     \
   T(NotIntegerSharedTypedArray, "% is not an integer shared typed array.")     \
   T(NotInt32SharedTypedArray, "% is not an int32 shared typed array.")         \
   T(ObjectGetterExpectingFunction,                                             \
     "Object.prototype.__defineGetter__: Expecting function")                   \
   T(ObjectGetterCallable, "Getter must be a function: %")                      \
   T(ObjectNotExtensible, "Can't add property %, object is not extensible")     \
   T(ObjectSetterExpectingFunction,                                             \
     "Object.prototype.__defineSetter__: Expecting function")                   \
   T(ObjectSetterCallable, "Setter must be a function: %")                      \
-  T(ObserveCallbackFrozen,                                                     \
-    "Object.observe cannot deliver to a frozen function object")               \
-  T(ObserveGlobalProxy, "% cannot be called on the global proxy object")       \
-  T(ObserveAccessChecked, "% cannot be called on access-checked objects")      \
-  T(ObserveInvalidAccept,                                                      \
-    "Third argument to Object.observe must be an array of strings.")           \
-  T(ObserveNonFunction, "Object.% cannot deliver to non-function")             \
-  T(ObserveNonObject, "Object.% cannot % non-object")                          \
-  T(ObserveNotifyNonNotifier, "notify called on non-notifier object")          \
-  T(ObservePerformNonFunction, "Cannot perform non-function")                  \
-  T(ObservePerformNonString, "Invalid non-string changeType")                  \
-  T(ObserveTypeNonString,                                                      \
-    "Invalid changeRecord with non-string 'type' property")                    \
   T(OrdinaryFunctionCalledAsConstructor,                                       \
     "Function object that's not a constructor was created with new")           \
   T(PromiseCyclic, "Chaining cycle detected for promise %")                    \
   T(PromiseExecutorAlreadyInvoked,                                             \
     "Promise executor has already been invoked with non-undefined arguments")  \
   T(PromiseNonCallable, "Promise resolve or reject function is not callable")  \
   T(PropertyDescObject, "Property description must be an object: %")           \
   T(PropertyNotFunction,                                                       \
     "'%' returned for property '%' of object '%' is not a function")           \
   T(ProtoObjectOrNull, "Object prototype may only be an Object or null: %")    \
@@ skipping 324 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static base::SmartArrayPointer<char> GetLocalizedMessage(Isolate* isolate,
                                                            Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_