Remove flutter_tools support for old AOT snapshotting (#34895)

Android now exclusively uses ELF shared libraries, and
iOS uses assembly.

packages/flutter_tools/gradle/flutter.gradle

@@ -268,13 +268,6 @@ class FlutterPlugin implements Plugin<Project> {
         }
     }
 
-    private static Boolean getBuildShareLibrary(Project project) {
-        if (project.hasProperty('build-shared-library')) {
-            return project.property('build-shared-library').toBoolean()
-        }
-        return false;
-    }
-
     private static Boolean splitPerAbi(Project project) {
         if (project.hasProperty('split-per-abi')) {
             return project.property('split-per-abi').toBoolean()
@@ -645,7 +638,6 @@ abstract class BaseFlutterTask extends DefaultTask {
                 args "build", "aot"
                 args "--suppress-analytics"
                 args "--quiet"
-                args "--build-shared-library"
                 args "--target", targetPath
                 args "--output-dir", "${intermediateDir}"
                 args "--target-platform", "${targetPlatform}"

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

@@ -92,7 +92,6 @@ class AOTSnapshotter {
     @required String mainPath,
     @required String packagesPath,
     @required String outputPath,
-    @required bool buildSharedLibrary,
     IOSArch iosArch,
     List<String> extraGenSnapshotOptions = const <String>[],
   }) async {
@@ -107,10 +106,6 @@ class AOTSnapshotter {
     // TODO(cbracken): replace IOSArch with TargetPlatform.ios_{armv7,arm64}.
     assert(platform != TargetPlatform.ios || iosArch != null);
 
-    // buildSharedLibrary is ignored for iOS builds.
-    if (platform == TargetPlatform.ios)
-      buildSharedLibrary = false;
-
     final PackageMap packageMap = PackageMap(packagesPath);
     final String packageMapError = packageMap.checkValid();
     if (packageMapError != null) {
@@ -143,26 +138,12 @@ class AOTSnapshotter {
       outputPaths.add(assembly);
       genSnapshotArgs.add('--snapshot_kind=app-aot-assembly');
       genSnapshotArgs.add('--assembly=$assembly');
-    } else if (buildSharedLibrary) {
+    } else {
       final String aotSharedLibrary = fs.path.join(outputDir.path, 'app.so');
       outputPaths.add(aotSharedLibrary);
       genSnapshotArgs.add('--snapshot_kind=app-aot-elf');
       genSnapshotArgs.add('--elf=$aotSharedLibrary');
       genSnapshotArgs.add('--strip');
-    } else {
-      // Blob AOT snapshot.
-      final String vmSnapshotData = fs.path.join(outputDir.path, 'vm_snapshot_data');
-      final String isolateSnapshotData = fs.path.join(outputDir.path, 'isolate_snapshot_data');
-      final String vmSnapshotInstructions = fs.path.join(outputDir.path, 'vm_snapshot_instr');
-      final String isolateSnapshotInstructions = fs.path.join(outputDir.path, 'isolate_snapshot_instr');
-      outputPaths.addAll(<String>[vmSnapshotData, isolateSnapshotData, vmSnapshotInstructions, isolateSnapshotInstructions]);
-      genSnapshotArgs.addAll(<String>[
-        '--snapshot_kind=app-aot-blobs',
-        '--vm_snapshot_data=$vmSnapshotData',
-        '--isolate_snapshot_data=$isolateSnapshotData',
-        '--vm_snapshot_instructions=$vmSnapshotInstructions',
-        '--isolate_snapshot_instructions=$isolateSnapshotInstructions',
-      ]);
     }
 
     if (platform == TargetPlatform.android_arm || iosArch == IOSArch.armv7) {
@@ -192,7 +173,6 @@ class AOTSnapshotter {
         'buildMode': buildMode.toString(),
         'targetPlatform': platform.toString(),
         'entryPoint': mainPath,
-        'sharedLib': buildSharedLibrary.toString(),
         'extraGenSnapshotOptions': extraGenSnapshotOptions.join(' '),
         'engineHash': Cache.instance.engineRevision,
         'buildersUsed': '${flutterProject != null ? flutterProject.hasBuilders : false}',

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -28,11 +28,6 @@ class BuildAotCommand extends BuildSubCommand with TargetPlatformBasedDevelopmen
         allowed: <String>['android-arm', 'android-arm64', 'ios'],
       )
       ..addFlag('quiet', defaultsTo: false)
-      ..addFlag('build-shared-library',
-        negatable: false,
-        defaultsTo: false,
-        help: 'Compile to a *.so file (requires NDK when building for Android).',
-      )
       ..addFlag('report-timings',
         negatable: false,
         defaultsTo: false,
@@ -122,7 +117,6 @@ class BuildAotCommand extends BuildSubCommand with TargetPlatformBasedDevelopmen
             mainPath: mainPath,
             packagesPath: PackageMap.globalPackagesPath,
             outputPath: outputPath,
-            buildSharedLibrary: false,
             extraGenSnapshotOptions: argResults[FlutterOptions.kExtraGenSnapshotOptions],
           ).then<int>((int buildExitCode) {
             return buildExitCode;
@@ -152,7 +146,6 @@ class BuildAotCommand extends BuildSubCommand with TargetPlatformBasedDevelopmen
           mainPath: mainPath,
           packagesPath: PackageMap.globalPackagesPath,
           outputPath: outputPath,
-          buildSharedLibrary: argResults['build-shared-library'],
           extraGenSnapshotOptions: argResults[FlutterOptions.kExtraGenSnapshotOptions],
         );
         if (snapshotExitCode != 0) {