Array length reduction should throw in strict mode if it can't delete an element.

include/v8.h

 // Copyright 2012 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 3173 matching lines @@
  * of the property access.
  */
 template<typename T>
 class PropertyCallbackInfo {
  public:
   V8_INLINE Isolate* GetIsolate() const;
   V8_INLINE Local<Value> Data() const;
   V8_INLINE Local<Object> This() const;
   V8_INLINE Local<Object> Holder() const;
   V8_INLINE ReturnValue<T> GetReturnValue() const;
+  V8_INLINE bool ShouldThrowOnError() const;
   // This shouldn't be public, but the arm compiler needs it.
-  static const int kArgsLength = 6;
+  static const int kArgsLength = 7;
 
  protected:
   friend class MacroAssembler;
   friend class internal::PropertyCallbackArguments;
   friend class internal::CustomArguments<PropertyCallbackInfo>;
-  static const int kHolderIndex = 0;
-  static const int kIsolateIndex = 1;
-  static const int kReturnValueDefaultValueIndex = 2;
-  static const int kReturnValueIndex = 3;
-  static const int kDataIndex = 4;
-  static const int kThisIndex = 5;
+  static const int kShouldThrowOnErrorIndex = 0;
+  static const int kHolderIndex = 1;
+  static const int kIsolateIndex = 2;
+  static const int kReturnValueDefaultValueIndex = 3;
+  static const int kReturnValueIndex = 4;
+  static const int kDataIndex = 5;
+  static const int kThisIndex = 6;
 
   V8_INLINE PropertyCallbackInfo(internal::Object** args) : args_(args) {}
   internal::Object** args_;
 };
 
 
 typedef void (*FunctionCallback)(const FunctionCallbackInfo<Value>& info);
 
 
 /**
@@ skipping 5038 matching lines @@
 Local<Object> PropertyCallbackInfo<T>::Holder() const {
   return Local<Object>(reinterpret_cast<Object*>(&args_[kHolderIndex]));
 }
 
 
 template<typename T>
 ReturnValue<T> PropertyCallbackInfo<T>::GetReturnValue() const {
   return ReturnValue<T>(&args_[kReturnValueIndex]);
 }
 
+template <typename T>
+bool PropertyCallbackInfo<T>::ShouldThrowOnError() const {
+  typedef internal::Internals I;
+  return args_[kShouldThrowOnErrorIndex] != I::IntToSmi(0);
+}
+
 
 Local<Primitive> Undefined(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
   I::CheckInitialized(isolate);
   S* slot = I::GetRoot(isolate, I::kUndefinedValueRootIndex);
   return Local<Primitive>(reinterpret_cast<Primitive*>(slot));
 }
 
 
@@ skipping 240 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_