Revert change 6302 until the compiler warning is addressed.

vm/raw_object.h

Index: vm/raw_object.h
===================================================================
--- vm/raw_object.h	(revision 6302)
+++ vm/raw_object.h	(working copy)
@@ -127,7 +127,6 @@
   VISITOR_SUPPORT(object)                                                      \
   friend class object;                                                         \
   friend class RawObject;                                                      \
-  friend class Heap;                                                           \
   DISALLOW_ALLOCATION();                                                       \
   DISALLOW_IMPLICIT_CONSTRUCTORS(Raw##object)
 
@@ -252,7 +251,6 @@
 
   void Validate() const;
   intptr_t VisitPointers(ObjectPointerVisitor* visitor);
-  bool FindObject(FindObjectVisitor* visitor);
 
   static RawObject* FromAddr(uword addr) {
     // We expect the untagged address here.
@@ -293,10 +291,8 @@
 
   intptr_t SizeFromClass() const;
 
-  friend class Heap;
   friend class Object;
   friend class Array;
-  friend class RawInstructions;
   friend class SnapshotWriter;
   friend class SnapshotReader;
   friend class MarkingVisitor;
@@ -351,7 +347,6 @@
 
   friend class Object;
   friend class RawInstance;
-  friend class RawInstructions;
   friend RawClass* AllocateFakeClass();
   friend class SnapshotReader;
 };
@@ -673,9 +668,6 @@
 
   // Variable length data follows here.
   int32_t data_[0];
-
-  friend class DartFrame;
-  friend class StubFrame;
 };
 
 
@@ -688,13 +680,7 @@
   // Variable length data follows here.
   uint8_t data_[0];
 
-  // Private helper function used while visiting stack frames. The
-  // code which iterates over dart frames is also called during GC and
-  // is not allowed to create handles.
-  static bool ContainsPC(RawObject* raw_obj, uword pc);
-
   friend class RawCode;
-  friend class StackFrame;
 };
 
 
@@ -728,8 +714,6 @@
     return reinterpret_cast<RawObject**>(&ptr()->bitmap_size_in_bytes_);
   }
   uword pc_;  // PC corresponding to this stack map representation.
-  intptr_t min_set_bit_offset_;  // Minimum bit offset which is set.
-  intptr_t max_set_bit_offset_;  // Maximum bit offset which is set.
 
   // Variable length data follows here (bitmap of the stack layout).
   uint8_t data_[0];
@@ -1050,7 +1034,6 @@
     return reinterpret_cast<RawObject**>(&ptr()->data()[length - 1]);
   }
 
-  friend class RawCode;
   friend class RawImmutableArray;
   friend class SnapshotReader;
   friend class GrowableObjectArray;