Use AOT snapshot of kernel_worker (#165103)

Use AOT snapshot of kernel_worker

Author: a-siva

engine/src/flutter/web_sdk/BUILD.gn

@@ -176,12 +176,13 @@ template("_kernel_worker") {
       if (is_win) {
         ext = ".exe"
       }
-      dart = rebase_path("$host_prebuilt_dart_sdk/bin/dart$ext", root_out_dir)
+      dartaot = rebase_path("$host_prebuilt_dart_sdk/bin/dartaotruntime$ext",
+                            root_out_dir)
       kernel_worker = rebase_path(
-              "$host_prebuilt_dart_sdk/bin/snapshots/kernel_worker.dart.snapshot")
+              "$host_prebuilt_dart_sdk/bin/snapshots/kernel_worker_aot.dart.snapshot")
 
       args = [
-               dart,
+               dartaot,
                kernel_worker,
              ] + invoker.args
     }