Revert "Resolve references to "this" the same way as normal variables"

test/mjsunit/debug-scopes.js

Index: test/mjsunit/debug-scopes.js
diff --git a/test/mjsunit/debug-scopes.js b/test/mjsunit/debug-scopes.js
index 1e1e22aa6bf5ccb45c4c149c60261239575f5021..ad137de205f80dea027b2a78d2191fab56342dc7 100644
--- a/test/mjsunit/debug-scopes.js
+++ b/test/mjsunit/debug-scopes.js
@@ -167,10 +167,6 @@ function CheckScopeContent(content, number, exec_state) {
   if (!scope.scopeObject().property('arguments').isUndefined()) {
     scope_size--;
   }
-  // Ditto for 'this'.
-  if (!scope.scopeObject().property('this').isUndefined()) {
-    scope_size--;
-  }
   // Skip property with empty name.
   if (!scope.scopeObject().property('').isUndefined()) {
     scope_size--;