Move print to corelib.

runtime/bin/builtin.dart

Index: runtime/bin/builtin.dart
diff --git a/runtime/bin/builtin.dart b/runtime/bin/builtin.dart
index d7f5974f96f8ef78caf40374e8b8e9d4e5cad60a..7d3831463d512536312463bad6075cabd0140729 100644
--- a/runtime/bin/builtin.dart
+++ b/runtime/bin/builtin.dart
@@ -5,15 +5,6 @@
 #library("builtin");
 #import("dart:uri");
 
-void print(arg) {
-  _Logger._printString(arg.toString());
-}
-
-class _Logger {
-  static void _printString(String s) native "Logger_PrintString";
-}
-
-
 // The URI that the entrypoint script was loaded from. Remembered so that
 // package imports can be resolved relative to it.
 var _entrypoint;
@@ -24,7 +15,7 @@ var _packageRoot;
 void _logResolution(String msg) {
   final enabled = false;
   if (enabled) {
-    _Logger._printString(msg);
+    print(msg);
   }
 }