Use correct Surface::Type for font lookups by unique name only

Currently, such lookups are accidentally recorded under
kLocalFontLookupByUniqueOrFamilyName due to a typo. This affects the
metrics recording for the identifiability study

Bug: 1136921
Change-Id: Ibf4a28a6edfabff0a570bd35c09686b5b020957d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463702Reviewed-by: Asanka Herath <asanka@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816675}

third_party/blink/renderer/platform/fonts/font_matching_metrics.cc

@@ -244,7 +244,7 @@ void FontMatchingMetrics::PublishIdentifiabilityMetrics() {
           {&font_lookups_by_unique_or_family_name_,
            IdentifiableSurface::Type::kLocalFontLookupByUniqueOrFamilyName},
           {&font_lookups_by_unique_name_only_,
-           IdentifiableSurface::Type::kLocalFontLookupByUniqueOrFamilyName},
+           IdentifiableSurface::Type::kLocalFontLookupByUniqueNameOnly},
           {&font_lookups_by_fallback_character_,
            IdentifiableSurface::Type::kLocalFontLookupByFallbackCharacter},
           {&font_lookups_as_last_resort_,