Revert automated changes made to deprecated settings.gradle (plugins.each) (#140037)

Restore testing deprecated settings.gradle (plugins.each).

Updated presumably by accident in #83067

Split from #137115
See also https://github.com/flutter/flutter/pull/137115#issuecomment-1781909865

dev/integration_tests/gradle_deprecated_settings/README.md

 # Deprecated settings.gradle
 
-This project is meant to test that apps using the current `android/settings.gradle`
-can still be built. This project can be removed once apps have been migrated to
-this new file.
+This project is meant to test that apps using the deprecated
+`android/settings.gradle` (_PluginEach_ used until Flutter v1.22.0) can still be built.
+This project can be removed once apps have been migrated to this new file.
 
 Issue: https://github.com/flutter/flutter/issues/54566

dev/integration_tests/gradle_deprecated_settings/android/settings.gradle

@@ -2,27 +2,23 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// This file is auto generated.
-// To update all the settings.gradle files in the Flutter repo,
-// See dev/tools/bin/generate_gradle_lockfiles.dart.
+// This is the `settings.gradle` file that apps were created with until Flutter
+// v1.22.0. This file has changed, so it must be migrated in existing projects.
 
-pluginManagement {
-    def flutterSdkPath = {
-        def properties = new Properties()
-        file("local.properties").withInputStream { properties.load(it) }
-        def flutterSdkPath = properties.getProperty("flutter.sdk")
-        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
-        return flutterSdkPath
-    }
-    settings.ext.flutterSdkPath = flutterSdkPath()
+include ':app'
 
-    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
 
-    plugins {
-        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
-    }
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
 }
 
-include ":app"
-
-apply from: "${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle/app_plugin_loader.gradle"
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}

packages/flutter_tools/test/integration.shard/deprecated_gradle_settings_test.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:file/src/interface/file.dart';
 import 'package:file_testing/file_testing.dart';
 import 'package:flutter_tools/src/base/io.dart';
 
@@ -16,6 +17,40 @@ void main() {
     final String workingDirectory = fileSystem.path.join(getFlutterRoot(), 'dev', 'integration_tests', 'gradle_deprecated_settings');
     final String flutterBin = fileSystem.path.join(getFlutterRoot(), 'bin', 'flutter');
 
+    final File settingsDotGradleFile = fileSystem.file(
+        fileSystem.path.join(workingDirectory, 'android', 'settings.gradle'));
+    const String expectedSettingsDotGradle = r"""
+// Copyright 2014 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.
+
+// This is the `settings.gradle` file that apps were created with until Flutter
+// v1.22.0. This file has changed, so it must be migrated in existing projects.
+
+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}
+""";
+
+    expect(
+      settingsDotGradleFile.readAsStringSync().trim().replaceAll('\r', ''),
+      equals(expectedSettingsDotGradle.trim()),
+    );
+
     final ProcessResult result = await processManager.run(<String>[
       flutterBin,
       'build',
@@ -25,11 +60,7 @@ void main() {
       '--verbose',
     ], workingDirectory: workingDirectory);
 
-    printOnFailure('Output of flutter build apk:');
-    printOnFailure(result.stdout.toString());
-    printOnFailure(result.stderr.toString());
-
-    expect(result.exitCode, 0);
+    expect(result, const ProcessResultMatcher());
 
     final String apkPath = fileSystem.path.join(
       workingDirectory, 'build', 'app', 'outputs', 'flutter-apk', 'app-debug.apk');