Revert "Build dart:zircon and dart:zircon_ffi (#28071)" (flutter/engine#28313)

This reverts commit 1e9b7aed566105eec982ca0eb545139b218bc916.

Reverting in order to land revert of the gn script_executable from
python3 to vpython3, which is causing flakes on Windows.

Issue: https://github.com/flutter/flutter/issues/88719

engine/src/flutter/shell/platform/fuchsia/BUILD.gn

@@ -77,7 +77,6 @@ group("fuchsia") {
   deps = [
     ":dart_binaries",
     ":flutter_binaries",
-    "dart-pkg",
     "dart_runner:dart_aot_${product_suffix}runner",
     "dart_runner:dart_jit_${product_suffix}runner",
     "flutter:flutter_aot_${product_suffix}runner",

engine/src/flutter/shell/platform/fuchsia/dart-pkg/BUILD.gn

@@ -1,7 +0,0 @@
-# Copyright 2013 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-group("dart-pkg") {
-  deps = [ "zircon:dart_zircon" ]
-}

engine/src/flutter/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn

@@ -3,7 +3,6 @@
 # found in the LICENSE file.
 
 import("//build/fuchsia/sdk.gni")
-import("//flutter/tools/fuchsia/dart/dart_library.gni")
 
 config("zircon_config") {
   include_dirs = [ "." ]
@@ -36,18 +35,3 @@ source_set("zircon") {
     "//flutter/third_party/tonic",
   ]
 }
-
-dart_library("dart_zircon") {
-  package_name = "zircon"
-
-  sources = [
-    "src/handle.dart",
-    "src/handle_disposition.dart",
-    "src/handle_waiter.dart",
-    "src/init.dart",
-    "src/system.dart",
-    "zircon.dart",
-  ]
-
-  deps = [ "../zircon_ffi:dart_zircon_ffi" ]
-}

engine/src/flutter/shell/platform/fuchsia/dart-pkg/zircon_ffi/BUILD.gn

@@ -3,7 +3,6 @@
 # found in the LICENSE file.
 
 import("//build/fuchsia/sdk.gni")
-import("//flutter/tools/fuchsia/dart/dart_library.gni")
 
 config("zircon_ffi_config") {
   include_dirs = [ "." ]
@@ -32,9 +31,3 @@ shared_library("zircon_ffi") {
     "//third_party/dart/runtime:dart_api",
   ]
 }
-
-dart_library("dart_zircon_ffi") {
-  package_name = "zircon_ffi"
-
-  sources = [ "zircon_ffi.dart" ]
-}

engine/src/flutter/tools/.vpython

@@ -1,4 +0,0 @@
-wheel: <
-  name: "infra/python/wheels/pyyaml/${vpython_platform}"
-  version: "version:3.12"
->

engine/src/flutter/tools/.vpython3

@@ -1,5 +0,0 @@
-python_version: "3.8"
-wheel: <
-  name: "infra/python/wheels/pyyaml-py3"
-  version: "version:5.3.1"
->

engine/src/flutter/tools/fuchsia/dart/dart_package_config.gni

@@ -77,7 +77,9 @@ template("dart_package_config") {
                              "visibility",
                            ])
 
-    script = "//flutter/tools/fuchsia/dart/gen_dart_package_config.py"
+    script =
+        get_label_info("//flutter/tools/fuchsia/dart:gen_dart_package_config",
+                       "target_out_dir") + "/gen_dart_package_config.pyz"
 
     inputs = [ intermediate_file ]
     outputs = [ package_config_file ]

engine/src/flutter/tools/fuchsia/dart/gen_dart_package_config.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env vpython3
+#!/usr/bin/env python3.8
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

engine/src/flutter/tools/fuchsia/sdk/find_dart_libraries.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env vpython3
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

engine/src/flutter/tools/gn

@@ -1,4 +1,4 @@
-#!/usr/bin/env vpython3
+#!/usr/bin/env python3
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

engine/src/flutter/tools/python/run_python3_action.py

@@ -1,10 +1,10 @@
-#!/usr/bin/env vpython3
+#!/usr/bin/env python
 #
 # Copyright 2021 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
 import sys
-import subprocess
 
-subprocess.run(['vpython3'] + sys.argv[1:])
+os.execv('/usr/bin/python3', ['python3'] + sys.argv[1:])