Revert r5455 from bleeding_edge: attempt to collect more garbage...

src/global-handles.h

Index: src/global-handles.h
===================================================================
--- src/global-handles.h	(revision 5680)
+++ src/global-handles.h	(working copy)
@@ -95,9 +95,8 @@
   // Tells whether global handle is weak.
   static bool IsWeak(Object** location);
 
-  // Process pending weak handles.  Returns true if any weak handle
-  // callback has been invoked.
-  static bool PostGarbageCollectionProcessing();
+  // Process pending weak handles.
+  static void PostGarbageCollectionProcessing();
 
   // Iterates over all strong handles.
   static void IterateStrongRoots(ObjectVisitor* v);