Unnecessary new (#20138)

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests
diff --git a/packages/flutter_tools/lib/src/context_runner.dart b/packages/flutter_tools/lib/src/context_runner.dart
index 6a01414..86c8ab5 100644
--- a/packages/flutter_tools/lib/src/context_runner.dart
+++ b/packages/flutter_tools/lib/src/context_runner.dart
@@ -46,36 +46,36 @@
     fallbacks: <Type, Generator>{
       AndroidSdk: AndroidSdk.locateAndroidSdk,
       AndroidStudio: AndroidStudio.latestValid,
-      AndroidWorkflow: () => new AndroidWorkflow(),
-      AndroidValidator: () => new AndroidValidator(),
-      Artifacts: () => new CachedArtifacts(),
+      AndroidWorkflow: () => AndroidWorkflow(),
+      AndroidValidator: () => AndroidValidator(),
+      Artifacts: () => CachedArtifacts(),
       AssetBundleFactory: () => AssetBundleFactory.defaultInstance,
       BotDetector: () => const BotDetector(),
-      Cache: () => new Cache(),
+      Cache: () => Cache(),
       Clock: () => const Clock(),
-      CocoaPods: () => new CocoaPods(),
-      Config: () => new Config(),
-      DevFSConfig: () => new DevFSConfig(),
-      DeviceManager: () => new DeviceManager(),
+      CocoaPods: () => CocoaPods(),
+      Config: () => Config(),
+      DevFSConfig: () => DevFSConfig(),
+      DeviceManager: () => DeviceManager(),
       Doctor: () => const Doctor(),
       DoctorValidatorsProvider: () => DoctorValidatorsProvider.defaultInstance,
-      EmulatorManager: () => new EmulatorManager(),
+      EmulatorManager: () => EmulatorManager(),
       Flags: () => const EmptyFlags(),
-      FlutterVersion: () => new FlutterVersion(const Clock()),
+      FlutterVersion: () => FlutterVersion(const Clock()),
       GenSnapshot: () => const GenSnapshot(),
-      HotRunnerConfig: () => new HotRunnerConfig(),
+      HotRunnerConfig: () => HotRunnerConfig(),
       IMobileDevice: () => const IMobileDevice(),
-      IOSSimulatorUtils: () => new IOSSimulatorUtils(),
+      IOSSimulatorUtils: () => IOSSimulatorUtils(),
       IOSWorkflow: () => const IOSWorkflow(),
       IOSValidator: () => const IOSValidator(),
       KernelCompiler: () => const KernelCompiler(),
-      Logger: () => platform.isWindows ? new WindowsStdoutLogger() : new StdoutLogger(),
-      OperatingSystemUtils: () => new OperatingSystemUtils(),
-      SimControl: () => new SimControl(),
+      Logger: () => platform.isWindows ? WindowsStdoutLogger() : StdoutLogger(),
+      OperatingSystemUtils: () => OperatingSystemUtils(),
+      SimControl: () => SimControl(),
       Stdio: () => const Stdio(),
-      Usage: () => new Usage(),
-      Xcode: () => new Xcode(),
-      XcodeProjectInterpreter: () => new XcodeProjectInterpreter(),
+      Usage: () => Usage(),
+      Xcode: () => Xcode(),
+      XcodeProjectInterpreter: () => XcodeProjectInterpreter(),
     },
   );
 }