[gardening] Add explicit type to ensure templated function applies.
[gardening] Add explicit type to ensure templated function applies.

Follow-up to d42de4ed062ffde5293fd4c862baf8167dfb1bcb

TEST=build engine ios_debug_arm target

Change-Id: I7f86f74467c7e7ed05feddfce921b46f05586e68
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/191326
Reviewed-by: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>
Commit-Queue: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk