Revert of [runtime] Introduce maps for the likely cases of FromPropertyDescriptor.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 2fa8de53ecfca47d029c628de013a7a2274b0e0b..429bd49c3399ec2d8bb620d1d46501ad840a1cf2 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2559,52 +2559,6 @@
 };
 
 
-// JSAccessorPropertyDescriptor is just a JSObject with a specific initial
-// map. This initial map adds in-object properties for "get", "set",
-// "enumerable" and "configurable" properties, as assigned by the
-// FromPropertyDescriptor function for regular accessor properties.
-class JSAccessorPropertyDescriptor: public JSObject {
- public:
-  // Offsets of object fields.
-  static const int kGetOffset = JSObject::kHeaderSize;
-  static const int kSetOffset = kGetOffset + kPointerSize;
-  static const int kEnumerableOffset = kSetOffset + kPointerSize;
-  static const int kConfigurableOffset = kEnumerableOffset + kPointerSize;
-  static const int kSize = kConfigurableOffset + kPointerSize;
-  // Indices of in-object properties.
-  static const int kGetIndex = 0;
-  static const int kSetIndex = 1;
-  static const int kEnumerableIndex = 2;
-  static const int kConfigurableIndex = 3;
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(JSAccessorPropertyDescriptor);
-};
-
-
-// JSDataPropertyDescriptor is just a JSObject with a specific initial map.
-// This initial map adds in-object properties for "value", "writable",
-// "enumerable" and "configurable" properties, as assigned by the
-// FromPropertyDescriptor function for regular data properties.
-class JSDataPropertyDescriptor: public JSObject {
- public:
-  // Offsets of object fields.
-  static const int kValueOffset = JSObject::kHeaderSize;
-  static const int kWritableOffset = kValueOffset + kPointerSize;
-  static const int kEnumerableOffset = kWritableOffset + kPointerSize;
-  static const int kConfigurableOffset = kEnumerableOffset + kPointerSize;
-  static const int kSize = kConfigurableOffset + kPointerSize;
-  // Indices of in-object properties.
-  static const int kValueIndex = 0;
-  static const int kWritableIndex = 1;
-  static const int kEnumerableIndex = 2;
-  static const int kConfigurableIndex = 3;
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataPropertyDescriptor);
-};
-
-
 // Common superclass for FixedArrays that allow implementations to share
 // common accessors and some code paths.
 class FixedArrayBase: public HeapObject {