Fix the build after previous commit.

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 019081fb8bc0e7d66925e7b3e5aaf6b436b7d37a..8c4f51d95a2824c6c92abb2f505e0a76968e9e4c 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -683,7 +683,8 @@ bool Debug::CompileDebuggerScript(int index) {
   bool allow_natives_syntax = FLAG_allow_natives_syntax;
   FLAG_allow_natives_syntax = true;
   Handle<JSFunction> boilerplate;
-  boilerplate = Compiler::Compile(source_code, script_name, 0, 0, NULL, NULL);
+  boilerplate = Compiler::Compile(source_code, script_name, 0, 0, NULL, NULL,
+                                  Handle<String>::null());
   FLAG_allow_natives_syntax = allow_natives_syntax;
 
   // Silently ignore stack overflows during compilation.