[Cobalt 1.1] Delete stub local_aggregation_1_1 files

To migrate this code smoothly into copybara, we will follow the
following steps:

1. Create placeholder files in the new directory
2. Add BUILD files with glob targets in the new directory
3. Move code into new directory, while moving placeholders into old directory
4. Delete BUILD files from old directory
5. Delete placeholder files

This is step 5

Bug: 111165
Bug: b/247019647
Change-Id: I7cbde5b184beea3e84c4cc5e3f4691f9eee00623
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt/+/739127
Fuchsia-Auto-Submit: Zach Bush <zmbush@google.com>
Reviewed-by: Cameron Dale <camrdale@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/src/local_aggregation_1_1/placeholder_local_aggregation.cc b/src/local_aggregation_1_1/placeholder_local_aggregation.cc
deleted file mode 100644
index e0c49c9..0000000
--- a/src/local_aggregation_1_1/placeholder_local_aggregation.cc
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright 2022 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This is a placeholder file that will be deleted after moving local_aggregation_1_1 into
-// local_aggregation
diff --git a/src/local_aggregation_1_1/placeholder_local_aggregation.h b/src/local_aggregation_1_1/placeholder_local_aggregation.h
deleted file mode 100644
index 557d9e4..0000000
--- a/src/local_aggregation_1_1/placeholder_local_aggregation.h
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2022 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef COBALT_SRC_LOCAL_AGGREGATION_1_1_PLACEHOLDER_LOCAL_AGGREGATION_H_
-#define COBALT_SRC_LOCAL_AGGREGATION_1_1_PLACEHOLDER_LOCAL_AGGREGATION_H_
-
-// This is a placeholder file that will be deleted after moving local_aggregation_1_1 into
-// local_aggregation
-
-#endif  // COBALT_SRC_LOCAL_AGGREGATION_1_1_PLACEHOLDER_LOCAL_AGGREGATION_H_
diff --git a/src/local_aggregation_1_1/placeholder_local_aggregation.proto b/src/local_aggregation_1_1/placeholder_local_aggregation.proto
deleted file mode 100644
index 6b8a888..0000000
--- a/src/local_aggregation_1_1/placeholder_local_aggregation.proto
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2020 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-syntax = "proto3";
-
-package cobalt.local_aggregation;
-
-// This is a placeholder file that will be deleted after moving local_aggregation_1_1 into
-// local_aggregation
diff --git a/tools/lint_gn_rules_present.py b/tools/lint_gn_rules_present.py
index c25fd36..bcefeea 100755
--- a/tools/lint_gn_rules_present.py
+++ b/tools/lint_gn_rules_present.py
@@ -20,10 +20,7 @@
 # When moving files into or out of src/public it is often done using symbolic
 # links. Since both copies of the file won't be in a build file, add one of them
 # to this list to allow this test to pass.
-ALLOW_ABSENCE = [
-  "src/local_aggregation_1_1/placeholder_local_aggregation.cc",
-  "src/local_aggregation_1_1/placeholder_local_aggregation.h",
-]
+ALLOW_ABSENCE = []
 
 def main():
   out_path = os.path.join(cobalt_root, 'out')