Merge ObjectIterator::has_next and ObjectIterator::next methods....

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
===================================================================
--- test/cctest/test-heap-profiler.cc	(revision 3683)
+++ test/cctest/test-heap-profiler.cc	(working copy)
@@ -64,10 +64,8 @@
   ConstructorHeapProfileTestHelper cons_profile;
   i::AssertNoAllocation no_alloc;
   i::HeapIterator iterator;
-  while (iterator.has_next()) {
-    i::HeapObject* obj = iterator.next();
+  for (i::HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next())
     cons_profile.CollectStats(obj);
-  }
   CHECK_EQ(0, cons_profile.f_count());
   cons_profile.PrintStats();
   CHECK_EQ(2, cons_profile.f_count());
@@ -375,10 +373,8 @@
   RetainerHeapProfile ret_profile;
   i::AssertNoAllocation no_alloc;
   i::HeapIterator iterator;
-  while (iterator.has_next()) {
-    i::HeapObject* obj = iterator.next();
+  for (i::HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next())
     ret_profile.CollectStats(obj);
-  }
   RetainerProfilePrinter printer;
   ret_profile.DebugPrintStats(&printer);
   const char* retainers_of_a = printer.GetRetainers("A");