Move StackTracer to sampler.h

src/frames.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 575 matching lines @@
   virtual int GetNumberOfIncomingArguments() const;
 
   // Garbage collection support. Iterates over incoming arguments,
   // receiver, and any callee-saved registers.
   void IterateArguments(ObjectVisitor* v) const;
 
  private:
   inline Object* function_slot_object() const;
 
   friend class StackFrameIterator;
-  friend class StackTracer;
 };
 
 
 class StubFrame : public StandardFrame {
  public:
   virtual Type type() const { return STUB; }
 
   // GC support.
   virtual void Iterate(ObjectVisitor* v) const;
 
@@ skipping 378 matching lines @@
 };
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_H_