Remove deprecated PrintableUnique.

src/compiler/js-graph.cc

Index: src/compiler/js-graph.cc
diff --git a/src/compiler/js-graph.cc b/src/compiler/js-graph.cc
index b229306d2b99333f38bd8597cbd8ef020cf1ac25..74eba98dc16107057feb8a5a845fa9dd5457ddb4 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -11,8 +11,7 @@ namespace internal {
 namespace compiler {
 
 Node* JSGraph::ImmovableHeapConstant(Handle<Object> object) {
-  PrintableUnique<Object> unique =
-      PrintableUnique<Object>::CreateImmovable(zone(), object);
+  Unique<Object> unique = Unique<Object>::CreateImmovable(object);
   return NewNode(common()->HeapConstant(unique));
 }
 
@@ -94,7 +93,7 @@ Node* JSGraph::NaNConstant() {
 }
 
 
-Node* JSGraph::HeapConstant(PrintableUnique<Object> value) {
+Node* JSGraph::HeapConstant(Unique<Object> value) {
   // TODO(turbofan): canonicalize heap constants using Unique<T>
   return NewNode(common()->HeapConstant(value));
 }
@@ -104,8 +103,7 @@ Node* JSGraph::HeapConstant(Handle<Object> value) {
   // TODO(titzer): We could also match against the addresses of immortable
   // immovables here, even without access to the heap, thus always
   // canonicalizing references to them.
-  return HeapConstant(
-      PrintableUnique<Object>::CreateUninitialized(zone(), value));
+  return HeapConstant(Unique<Object>::CreateUninitialized(value));
 }