[fuchsia] Migrate to new RealmBuilder API (#39205)

See https://fxrev.dev/793422.

Missed in d85ec02,
ade610e and
6fe9861.

Author: tamird

shell/platform/fuchsia/flutter/tests/integration/touch-input/touch-input-test.cc

@@ -226,7 +226,7 @@ class FlutterTapTestBase : public PortableUITest,
 
     // Get the display dimensions.
     FML_LOG(INFO) << "Waiting for scenic display info";
-    scenic_ = realm_root()->template Connect<fuchsia::ui::scenic::Scenic>();
+    scenic_ = realm_root()->component().Connect<fuchsia::ui::scenic::Scenic>();
     scenic_->GetDisplayInfo([this](fuchsia::ui::gfx::DisplayInfo display_info) {
       display_width_ = display_info.width_in_px;
       display_height_ = display_info.height_in_px;
@@ -345,7 +345,7 @@ class FlutterEmbedTapTest : public FlutterTapTestBase {
 
     // Get the display dimensions.
     FML_LOG(INFO) << "Waiting for scenic display info";
-    scenic_ = realm_root()->template Connect<fuchsia::ui::scenic::Scenic>();
+    scenic_ = realm_root()->component().Connect<fuchsia::ui::scenic::Scenic>();
     scenic_->GetDisplayInfo([this](fuchsia::ui::gfx::DisplayInfo display_info) {
       display_width_ = display_info.width_in_px;
       display_height_ = display_info.height_in_px;