Remove stray imports of StyleMetrics #16024

Job	Run time
android	2m 2s
cpp_cmake (macos-12, 1.73)	13m 28s
cpp_test_driver (ubuntu-22.04)	6m 30s
cpp_cmake (windows-2022, nightly)	10m 48s
build_and_test (ubuntu-22.04, 1.73)	13m 28s
cpp_test_driver (macos-12)	8m 0s
cpp_cmake (ubuntu-22.04, stable)	6m 40s
cpp_test_driver (windows-2022)	7m 43s
esp-idf-quick	8m 38s
build_and_test (macos-12, stable)	27m 0s
build_and_test (windows-2022, stable)	22m 0s
ffi_32bit_build	1m 10s
build_and_test (windows-2022, 1.73)	20m 10s
mcu (pico-st7789, thumbv6m-none-eabi)	29s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	20m 35s
fmt_test	2m 30s
mcu (stm32h735g, thumbv7em-none-eabihf)	46s
mcu_esp	2m 31s
build_and_test (ubuntu-22.04, nightly)	9m 18s
miri	53s
node_test (ubuntu-22.04)	3m 4s
python_test (ubuntu-22.04)	2m 2s
node_test (macos-12)	11m 7s
python_test (macos-12)	1m 31s
updater_test (0.3.0)	1m 31s
node_test (windows-2022)	15m 44s
python_test (windows-2022)	1m 42s
docs / docs	6m 21s
tree-sitter / tree-sitter-tests	9s
wasm / wasm	3m 36s
wasm_demo / wasm_demo	1m 24s
wasm / lint-slintpad	25s
wasm / build-slintpad	44s
cpp_package_test	2m 34s
	3h 56m 33s

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