[strong] Fix scoping related errors for methods.

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 186530ceab2ef134b2384ef32e5b9b588ecc182e..1508ce8ab1da81ba8a8f633a504d41d675b39bc0 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -281,6 +281,7 @@ class Scope: public ZoneObject {
   bool is_block_scope() const { return scope_type_ == BLOCK_SCOPE; }
   bool is_with_scope() const { return scope_type_ == WITH_SCOPE; }
   bool is_arrow_scope() const { return scope_type_ == ARROW_SCOPE; }
+  bool is_class_scope() const { return scope_type_ == CLASS_SCOPE; }
   bool is_declaration_scope() const {
     return is_eval_scope() || is_function_scope() ||
         is_module_scope() || is_script_scope();
@@ -658,6 +659,8 @@ class Scope: public ZoneObject {
   bool ResolveVariablesRecursively(CompilationInfo* info,
                                    AstNodeFactory* factory);
 
+  bool CheckStrongModeDeclaration(VariableProxy* proxy, Variable* var);
+
   // Scope analysis.
   void PropagateScopeInfo(bool outer_scope_calls_sloppy_eval);
   bool HasTrivialContext() const;