Simplify implementation of assignment-to-const checks

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index c60c2e7d49c2f0587c79120e8e62ba3ea78cef1e..3ca2dcf0ce259c6fafc57bb05a3e4bbf2160671e 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -224,11 +224,6 @@ class Scope: public ZoneObject {
   // scope over a let binding of the same name.
   Declaration* CheckConflictingVarDeclarations();
 
-  // For harmony block scoping mode: Check if the scope has variable proxies
-  // that are used as lvalues and point to const variables. Assumes that scopes
-  // have been analyzed and variables been resolved.
-  VariableProxy* CheckAssignmentToConst();
-
   // ---------------------------------------------------------------------------
   // Scope-specific info.