Inline extensions .gypi files into GN build.

extensions/shell/common/api/schemas.gni

Index: extensions/shell/common/api/schemas.gni
diff --git a/extensions/shell/common/api/schemas.gni b/extensions/shell/common/api/schemas.gni
deleted file mode 100644
index fd842da2fc94a81ea8e3cc4bdc2750e2156ff7c3..0000000000000000000000000000000000000000
--- a/extensions/shell/common/api/schemas.gni
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-gypi_values = exec_script("//build/gypi_to_gn.py",
-                          [ rebase_path("schemas.gypi") ],
-                          "scope",
-                          [ "schemas.gypi" ])
-
-schema_sources = gypi_values.schema_files
-if (is_chromeos) {
-  schema_sources += gypi_values.chromeos_schema_files
-}
-
-uncompiled_sources = gypi_values.non_compiled_schema_files
-
-root_namespace = "extensions::shell::api::%(namespace)s"