Proxies: Make 'with' work, plus minor other fixes

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1035 matching lines @@
                                                        JSFunction* function);
 
   // Allocate a catch context.
   MUST_USE_RESULT MaybeObject* AllocateCatchContext(JSFunction* function,
                                                     Context* previous,
                                                     String* name,
                                                     Object* thrown_object);
   // Allocate a 'with' context.
   MUST_USE_RESULT MaybeObject* AllocateWithContext(JSFunction* function,
                                                    Context* previous,
-                                                   JSObject* extension);
+                                                   JSReceiver* extension);
 
   // Allocate a block context.
   MUST_USE_RESULT MaybeObject* AllocateBlockContext(JSFunction* function,
                                                     Context* previous,
                                                     ScopeInfo* info);
 
   // Allocates a new utility object in the old generation.
   MUST_USE_RESULT MaybeObject* AllocateStruct(InstanceType type);
 
   // Allocates a function initialized with a shared part.
@@ skipping 2027 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_