Remove deprecated dart:profiler library

runtime/lib/profiler_sources.gypi

Index: runtime/lib/profiler_sources.gypi
diff --git a/runtime/lib/profiler_sources.gypi b/runtime/lib/profiler_sources.gypi
deleted file mode 100644
index 9175427107a3e4c8ffcb9d65e9a7d2c5ebb33ba4..0000000000000000000000000000000000000000
--- a/runtime/lib/profiler_sources.gypi
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-# Sources list to keep vm/BUILD.gn generate_core_libraries happy.
-
-{
-  'sources': [
-    'empty_source.dart'
-  ],
-}
-