Fix erroneous comments referring to blobs snapshots. (#41378)

dev/devicelab/bin/tasks/module_host_with_custom_build_test.dart

@@ -236,7 +236,7 @@ Future<void> main() async {
         return TaskResult.failure('Failed to build app-demo-release-unsigned.apk');
       }
 
-      section('Verify AOT blobs in app-demo-release-unsigned.apk');
+      section('Verify AOT ELF in app-demo-release-unsigned.apk');
 
       checkCollectionContains<String>(<String>[
         ...flutterAssets,
@@ -274,7 +274,7 @@ Future<void> main() async {
         return TaskResult.failure('Failed to build app-demo-prod-unsigned.apk');
       }
 
-      section('Verify AOT blobs in app-demo-prod-unsigned.apk');
+      section('Verify AOT ELF in app-demo-prod-unsigned.apk');
 
       checkCollectionContains<String>(<String>[
         ...flutterAssets,

dev/devicelab/lib/tasks/perf_tests.dart

@@ -342,7 +342,6 @@ class CompileTest {
   }
 
   static Future<Map<String, dynamic>> _compileAot() async {
-    // Generate blobs instead of assembly.
     await flutter('clean');
     final Stopwatch watch = Stopwatch()..start();
     final List<String> options = <String>[