[debugger] correctly find function context.

src/debug/debug-scopes.cc

 // Copyright 2015 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/debug/debug-scopes.h"
 
 #include "src/ast/scopes.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
 #include "src/globals.h"
@@ skipping 449 matching lines @@
 
   Handle<Context> frame_context(Context::cast(frame_inspector_->GetContext()));
 
   HandleScope scope(isolate_);
   Handle<SharedFunctionInfo> shared(function->shared());
   Handle<ScopeInfo> scope_info(shared->scope_info());
 
   if (!scope_info->HasContext()) return local_scope;
 
   // Third fill all context locals.
-  Handle<Context> function_context(frame_context->declaration_context());
+  Handle<Context> function_context(frame_context->closure_context());
   CopyContextLocalsToScopeObject(scope_info, function_context, local_scope);
 
   // Finally copy any properties from the function context extension.
   // These will be variables introduced by eval.
   if (function_context->closure() == *function &&
       function_context->has_extension() &&
       !function_context->IsNativeContext()) {
     bool success = CopyContextExtensionToScopeObject(
         handle(function_context->extension_object(), isolate_),
         local_scope, JSReceiver::INCLUDE_PROTOS);
@@ skipping 331 matching lines @@
         isolate_, value, Object::GetPropertyOrElement(extension, key), false);
     RETURN_ON_EXCEPTION_VALUE(
         isolate_, JSObject::SetOwnPropertyIgnoreAttributes(
             scope_object, key, value, NONE), false);
   }
   return true;
 }
 
 }  // namespace internal
 }  // namespace v8