Reuse IdentifiabilityStudySettings::IsSurfaceAllowed instead of repeating most of it.

Change-Id: I0168ff4b278c1542600313dc7f3c1d7bed3d580b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492600
Commit-Queue: Chris Fredrickson <cfredric@google.com>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Auto-Submit: Chris Fredrickson <cfredric@google.com>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819975}

third_party/blink/common/privacy_budget/identifiability_study_settings.cc

@@ -138,13 +138,7 @@ bool IdentifiabilityStudySettings::IsTypeAllowed(
 
 bool IdentifiabilityStudySettings::IsWebFeatureAllowed(
     mojom::WebFeature feature) const {
-  if (LIKELY(!is_enabled_))
-    return false;
-
-  if (LIKELY(!is_any_surface_or_type_blocked_))
-    return true;
-
-  return provider_->IsSurfaceAllowed(IdentifiableSurface::FromTypeAndToken(
+  return IsSurfaceAllowed(IdentifiableSurface::FromTypeAndToken(
       IdentifiableSurface::Type::kWebFeature, feature));
 }