Revert 11927 "Fix liveedit heap traversal bug with write barrier"

A test was broken by r11927

Review URL: https://chromiumcodereview.appspot.com/10667025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11928 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/liveedit.cc

@@ -968,14 +968,6 @@ class ReplacingVisitor : public ObjectVisitor {
 static void ReplaceCodeObject(Code* original, Code* substitution) {
   ASSERT(!HEAP->InNewSpace(substitution));
 
-  // Perform a full GC in order to ensure that we are not in the middle of an
-  // incremental marking phase when we are replacing the code object.
-  // Since we are not in an incremental marking phase we can write pointers
-  // to code objects (that are never in new space) without worrying about
-  // write barriers.
-  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "liveedit.cc ReplaceCodeObject");
-
   AssertNoAllocation no_allocations_please;
 
   ReplacingVisitor visitor(original, substitution);