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

src/runtime/runtime-debug.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug.h"
@@ skipping 1280 matching lines @@
   // Move to the next scope.
   void Next() {
     DCHECK(!failed_);
     ScopeType scope_type = Type();
     if (scope_type == ScopeTypeGlobal) {
       // The global scope is always the last in the chain.
       DCHECK(context_->IsNativeContext());
       context_ = Handle<Context>();
       return;
     }
-    if (scope_type == ScopeTypeScript) seen_script_scope_ = true;
-    if (nested_scope_chain_.is_empty()) {
-      if (scope_type == ScopeTypeScript) {
-        if (context_->IsScriptContext()) {
-          context_ = Handle<Context>(context_->previous(), isolate_);
-        }
-        CHECK(context_->IsNativeContext());
-      } else {
+    if (scope_type == ScopeTypeScript) {
+      seen_script_scope_ = true;
+      if (context_->IsScriptContext()) {
         context_ = Handle<Context>(context_->previous(), isolate_);
       }
+      if (!nested_scope_chain_.is_empty()) {
+        DCHECK_EQ(nested_scope_chain_.last()->scope_type(), SCRIPT_SCOPE);
+        nested_scope_chain_.RemoveLast();
+        DCHECK(nested_scope_chain_.is_empty());
+      }
+      CHECK(context_->IsNativeContext());
+      return;
+    }
+    if (nested_scope_chain_.is_empty()) {
+      context_ = Handle<Context>(context_->previous(), isolate_);
     } else {
       if (nested_scope_chain_.last()->HasContext()) {
         DCHECK(context_->previous() != NULL);
         context_ = Handle<Context>(context_->previous(), isolate_);
       }
       nested_scope_chain_.RemoveLast();
     }
   }
 
   // Return the type of the current scope.
@@ skipping 1655 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }
 }  // namespace v8::internal