- Remove heap tracing.

runtime/vm/heap.h

Index: runtime/vm/heap.h
===================================================================
--- runtime/vm/heap.h	(revision 21785)
+++ runtime/vm/heap.h	(working copy)
@@ -15,7 +15,6 @@
 namespace dart {
 
 // Forward declarations.
-class HeapTrace;
 class Isolate;
 class ObjectPointerVisitor;
 class ObjectSet;
@@ -151,10 +150,6 @@
   // Verify that all pointers in the heap point to the heap.
   bool Verify() const;
 
-  // Accessor function to get the HeapTrace used for tracing.  There
-  // should only ever be one of these per isolate
-  HeapTrace* trace() const { return heap_trace_; }
-
   // Print heap sizes.
   void PrintSizes() const;
 
@@ -246,9 +241,6 @@
   // GC stats collection.
   GCStats stats_;
 
-  // The active heap trace.
-  HeapTrace* heap_trace_;
-
   // This heap is in read-only mode: No allocation is allowed.
   bool read_only_;