Debugger: do not reject data parsed in the background when debugging.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 55415fe14f515b6d1aa2464eda7f1b910bf2dae5..81bffc5ac49a79924e5083833f7e934d8894d945 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -1327,8 +1327,8 @@ Handle<SharedFunctionInfo> Compiler::CompileStreamedScript(
 
   CompilationInfo compile_info(parse_info);
 
-  // If compiling for debugging, parse eagerly from scratch.
-  if (compile_info.is_debug()) parse_info->set_literal(NULL);
+  // The source was parsed lazily, so compiling for debugging is not possible.
+  DCHECK(!compile_info.is_debug());
 
   return CompileToplevel(&compile_info);
 }