Kill dead code

[dnfield]

This code is not used anywhere.

[zanderso]

lgtm

[jonahwilliams]

LGTM

[codecov]

Codecov Report

Merging #38652 into master will decrease coverage by 0.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #38652      +/-   ##
==========================================
- Coverage   56.26%   55.72%   -0.54%     
==========================================
  Files         195      195              
  Lines       18304    18251      -53     
==========================================
- Hits        10298    10170     -128     
- Misses       8006     8081      +75

Flag	Coverage Δ
#flutter_tool	55.72% <ø> (-0.54%)	⬇️

Impacted Files	Coverage Δ
packages/flutter_tools/lib/src/base/build.dart	68.03% <ø> (-5.69%)	⬇️
...lutter_tools/lib/src/build_system/targets/ios.dart	0% <0%> (-76.6%)	⬇️
...utter_tools/lib/src/build_system/targets/dart.dart	49.2% <0%> (-25.4%)	⬇️
packages/flutter_tools/lib/src/macos/xcode.dart	42.85% <0%> (-10.72%)	⬇️
...ackages/flutter_tools/lib/src/commands/daemon.dart	24.65% <0%> (-9.54%)	⬇️
packages/flutter_tools/lib/src/device.dart	54.81% <0%> (-2.41%)	⬇️
packages/flutter_tools/lib/src/artifacts.dart	65.6% <0%> (-2.13%)	⬇️
packages/flutter_tools/lib/src/context_runner.dart	66.66% <0%> (-1.97%)	⬇️
packages/flutter_tools/lib/src/version.dart	90.73% <0%> (-1.96%)	⬇️
packages/flutter_tools/lib/src/build_info.dart	69.94% <0%> (-1.64%)	⬇️
... and 8 more

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