Remove the .zip method from OSUtils, as it was not used (#67367)

We used to use zip to verify the integrity of downloaded zip archives, but we now use unzip. This removes the .zip method from OperatingSystemUtils.

packages/flutter_tools/lib/src/base/os.dart

@@ -90,8 +90,6 @@ abstract class OperatingSystemUtils {
   /// Return the File representing a new pipe.
   File makePipe(String path);
 
-  void zip(Directory data, File zipFile);
-
   void unzip(File file, Directory targetDirectory);
 
   void unpack(File gzippedTarFile, Directory targetDirectory);
@@ -206,30 +204,6 @@ class _PosixUtils extends OperatingSystemUtils {
     ).toList();
   }
 
-  @override
-  void zip(Directory data, File zipFile) {
-    try {
-      _processUtils.runSync(
-        <String>['zip', '-r', '-q', zipFile.path, '.'],
-        workingDirectory: data.path,
-        throwOnError: true,
-        verboseExceptions: true,
-      );
-    } on ArgumentError {
-      // zip is not available. this error message is modeled after the download
-      // error in bin/internal/update_dart_sdk.sh
-      String message = 'Please install zip.';
-      if (_platform.isMacOS) {
-        message = 'Consider running "brew install zip".';
-      } else if (_platform.isLinux) {
-        message = 'Consider running "sudo apt-get install zip".';
-      }
-      throwToolExit(
-        'Missing "zip" tool. Unable to compress ${data.path}.\n$message'
-      );
-    }
-  }
-
   // unzip -o -q zipfile -d dest
   @override
   void unzip(File file, Directory targetDirectory) {
@@ -342,21 +316,6 @@ class _WindowsUtils extends OperatingSystemUtils {
     return <File>[_fileSystem.file(lines.first.trim())];
   }
 
-  @override
-  void zip(Directory data, File zipFile) {
-    final Archive archive = Archive();
-    for (final FileSystemEntity entity in data.listSync(recursive: true)) {
-      if (entity is! File) {
-        continue;
-      }
-      final File file = entity as File;
-      final String path = file.fileSystem.path.relative(file.path, from: data.path);
-      final List<int> bytes = file.readAsBytesSync();
-      archive.addFile(ArchiveFile(path, bytes.length, bytes));
-    }
-    zipFile.writeAsBytesSync(ZipEncoder().encode(archive), flush: true);
-  }
-
   @override
   void unzip(File file, Directory targetDirectory) {
     final Archive archive = ZipDecoder().decodeBytes(file.readAsBytesSync());

packages/flutter_tools/test/general.shard/base/os_test.dart

@@ -192,56 +192,6 @@ void main() {
     );
   });
 
-  testWithoutContext('If zip throws an ArgumentError, display an install message', () {
-    final FileSystem fileSystem = MemoryFileSystem.test();
-    when(mockProcessManager.runSync(
-      <String>['zip', '-r', '-q', 'foo.zip', '.'],
-      workingDirectory: anyNamed('workingDirectory'),
-    )).thenThrow(ArgumentError());
-
-    final OperatingSystemUtils linuxOsUtils = OperatingSystemUtils(
-      fileSystem: fileSystem,
-      logger: BufferLogger.test(),
-      platform: FakePlatform(operatingSystem: 'linux'),
-      processManager: mockProcessManager,
-    );
-
-    expect(
-      () => linuxOsUtils.zip(fileSystem.currentDirectory, fileSystem.file('foo.zip')),
-      throwsToolExit(
-        message: 'Missing "zip" tool. Unable to compress /.\n'
-        'Consider running "sudo apt-get install zip".'),
-    );
-
-    final OperatingSystemUtils macOSUtils = OperatingSystemUtils(
-      fileSystem: fileSystem,
-      logger: BufferLogger.test(),
-      platform: FakePlatform(operatingSystem: 'macos'),
-      processManager: mockProcessManager,
-    );
-
-    expect(
-      () => macOSUtils.zip(fileSystem.currentDirectory, fileSystem.file('foo.zip')),
-      throwsToolExit
-      (message: 'Missing "zip" tool. Unable to compress /.\n'
-        'Consider running "brew install zip".'),
-    );
-
-    final OperatingSystemUtils unknownOsUtils = OperatingSystemUtils(
-      fileSystem: fileSystem,
-      logger: BufferLogger.test(),
-      platform: FakePlatform(operatingSystem: 'fuchsia'),
-      processManager: mockProcessManager,
-    );
-
-    expect(
-      () => unknownOsUtils.zip(fileSystem.currentDirectory, fileSystem.file('foo.zip')),
-      throwsToolExit
-      (message: 'Missing "zip" tool. Unable to compress /.\n'
-        'Please install zip.'),
-    );
-  });
-
   testWithoutContext('stream compression level', () {
     expect(OperatingSystemUtils.gzipLevel1.level, equals(1));
   });

packages/flutter_tools/test/src/context.dart

@@ -306,9 +306,6 @@ class FakeOperatingSystemUtils implements OperatingSystemUtils {
   @override
   File makePipe(String path) => null;
 
-  @override
-  void zip(Directory data, File zipFile) { }
-
   @override
   void unzip(File file, Directory targetDirectory) { }