- Remove the unvisited handles code from handles implementation as it is not

runtime/vm/handles.h

Index: runtime/vm/handles.h
===================================================================
--- runtime/vm/handles.h	(revision 23690)
+++ runtime/vm/handles.h	(working copy)
@@ -77,8 +77,7 @@
   Handles()
       : zone_blocks_(NULL),
         first_scoped_block_(NULL),
-        scoped_blocks_(&first_scoped_block_),
-        last_visited_block_(NULL) {
+        scoped_blocks_(&first_scoped_block_) {
   }
   ~Handles() {
     DeleteAll();
@@ -139,8 +138,7 @@
   class HandlesBlock {
    public:
     explicit HandlesBlock(HandlesBlock* next)
-        : last_visited_handle_(0),
-          next_handle_slot_(0),
+        : next_handle_slot_(0),
           next_block_(next) { }
     ~HandlesBlock();
 
@@ -170,10 +168,6 @@
     // Visit all object pointers in the handle block.
     void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
-    // Visit all the object pointers in the block since the last time this
-    // method was called.
-    void VisitUnvisitedObjectPointers(ObjectPointerVisitor* visitor);
-
     // Visit all of the handles in the handle block.
     void Visit(HandleVisitor* visitor);
 
@@ -194,10 +188,6 @@
     void set_next_block(HandlesBlock* next) { next_block_ = next; }
 
    private:
-    // Last handle visited by VisitUnvisitedObjectPointers.  Handles
-    // at, or beyond this index are new.
-    intptr_t last_visited_handle_;
-
     uword data_[kHandleSizeInWords * kHandlesPerChunk];  // Handles area.
     intptr_t next_handle_slot_;  // Next slot for allocation in current block.
     HandlesBlock* next_block_;  // Link to next block of handles.
@@ -234,8 +224,6 @@
   HandlesBlock* zone_blocks_;  // List of zone handles.
   HandlesBlock first_scoped_block_;  // First block of scoped handles.
   HandlesBlock* scoped_blocks_;  // List of scoped handles.
-  // Last block visited by VisitUnvisitedHandles.
-  HandlesBlock* last_visited_block_;
 
   friend class HandleScope;
   friend class Dart;