Revert of [debugger] debug-evaluate should not not modify local values.

src/debug/debug-evaluate.h

Index: src/debug/debug-evaluate.h
diff --git a/src/debug/debug-evaluate.h b/src/debug/debug-evaluate.h
index c0b1f027d16c2e11e0a0b56b36caf25c42d22d4d..178e2378817a37e0f1cc6e724d32797e24714dfc 100644
--- a/src/debug/debug-evaluate.h
+++ b/src/debug/debug-evaluate.h
@@ -54,7 +54,6 @@
     void UpdateValues();
 
     Handle<Context> innermost_context() const { return innermost_context_; }
-    Handle<Context> native_context() const { return native_context_; }
     Handle<SharedFunctionInfo> outer_info() const { return outer_info_; }
 
    private:
@@ -88,14 +87,13 @@
                                         bool this_is_non_local);
 
     MaybeHandle<Object> LoadFromContext(Handle<Context> context,
-                                        Handle<String> name, bool* global);
+                                        Handle<String> name);
 
     void StoreToContext(Handle<Context> context, Handle<String> name,
                         Handle<Object> value);
 
     Handle<SharedFunctionInfo> outer_info_;
     Handle<Context> innermost_context_;
-    Handle<Context> native_context_;
     List<ContextChainElement> context_chain_;
     List<Handle<String> > non_locals_;
     Isolate* isolate_;