Mostly revert "[fuchsia] Prepare for setting the Dart target architecture appropriately in the host…

utils/generate_patch_sdk.gni

Index: utils/generate_patch_sdk.gni
diff --git a/utils/generate_patch_sdk.gni b/utils/generate_patch_sdk.gni
index 4ec995784dd982469c7308f03bbbecee89a65228..4fd74a1c9b85046ff5ed916502a68dd4b3a46c8a 100644
--- a/utils/generate_patch_sdk.gni
+++ b/utils/generate_patch_sdk.gni
@@ -28,7 +28,7 @@ template("generate_patched_sdk") {
     }
 
     if (!prebuilt_dart_exe_works) {
-      deps += [ "$_dart_root/runtime/bin:dart_bootstrap_host_arch($host_toolchain)" ]
+      deps += [ "$_dart_root/runtime/bin:dart_bootstrap($host_toolchain)" ]
     }
 
     script = "$_dart_root/tools/patch_sdk.py"
@@ -49,10 +49,10 @@ template("generate_patched_sdk") {
     args = [ "--quiet" ]
     if (!prebuilt_dart_exe_works) {
       dart_out_dir = get_label_info(
-              "$_dart_root/runtime/bin:dart_bootstrap_host_arch($host_toolchain)",
+              "$_dart_root/runtime/bin:dart_bootstrap($host_toolchain)",
               "root_out_dir")
-      dart_bootstrap = rebase_path(
-              "$dart_out_dir/dart_bootstrap_host_arch$executable_suffix")
+      dart_bootstrap =
+          rebase_path("$dart_out_dir/dart_bootstrap$executable_suffix")
       args += [
         "--dart-executable",
         dart_bootstrap,