Remove SK_USE_SCALED_FONTMETRICS.

This define was added in
"SK_USE_SCALED_FONTMETRICS for correct scaling"
c17c6582ec0b7bc211d7de9e8d634692d239c123.
Users all now define this flag, so it may now be removed.

BUG=chromium:420901

Review URL: https://codereview.chromium.org/720743003
1 file changed