Revert "[vm] Pass snapshot flag to kernel_service"

This reverts commit f8b0d26.

Reason for revert: Multiple test failures in app-jit and simarm(64)

Original change's description:
> [vm] Pass snapshot flag to kernel_service
>
> Enable reporting of null safety compilation mode when running
> `dart compile aot-snapshot`, `dart compile jit-snapshot`,
> and `dart compile kernel`.
>
> Closes flutter#44234
>
> TEST=pkg/dartdev/test/commands/compile_test.dart
>
> Change-Id: I0d4b35c6ccb4167c0c7539a4eb24a5139e29cf53
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/178990
> Commit-Queue: Johnni Winther <johnniwinther@google.com>
> Reviewed-by: Ben Konyi <bkonyi@google.com>

TBR=bkonyi@google.com,johnniwinther@google.com

Change-Id: I83aeaa8620c640d02d5ccfd1fe8112d8209a9ad4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/179773
Auto-Submit: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

Author: askeksa

pkg/dartdev/test/commands/compile_test.dart

@@ -356,145 +356,4 @@ void main() {}
     expect(File(outFile).existsSync(), true,
         reason: 'File not found: $outFile');
   });
-
-  test('Compile AOT snapshot with sound null safety', () {
-    final p = project(mainSrc: '''void main() {}''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'myaot'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'aot-snapshot',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(soundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
-
-  test('Compile AOT snapshot with unsound null safety', () {
-    final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'myaot'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'aot-snapshot',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(unsoundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
-
-  test('Compile kernel with sound null safety', () {
-    final p = project(mainSrc: '''void main() {}''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'kernel',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(soundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
-
-  test('Compile kernel with unsound null safety', () {
-    final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'kernel',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(unsoundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
-
-  test('Compile JIT snapshot with sound null safety', () {
-    final p = project(mainSrc: '''void main() {}''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'myjit'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'jit-snapshot',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(soundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
-
-  test('Compile JIT snapshot with unsound null safety', () {
-    final p = project(mainSrc: '''
-// @dart=2.9
-void main() {}
-''');
-    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
-    final outFile = path.canonicalize(path.join(p.dirPath, 'myjit'));
-
-    var result = p.runSync(
-      [
-        'compile',
-        'jit-snapshot',
-        '-o',
-        outFile,
-        inFile,
-      ],
-    );
-
-    expect(result.stdout, contains(unsoundNullSafetyMessage));
-    expect(result.stderr, isEmpty);
-    expect(result.exitCode, 0);
-    expect(File(outFile).existsSync(), true,
-        reason: 'File not found: $outFile');
-  });
 }