[Ozone] Add default case otherwise compiler complains about missing return

content/browser/compositor/overlay_candidate_validator_ozone.cc

Index: content/browser/compositor/overlay_candidate_validator_ozone.cc
diff --git a/content/browser/compositor/overlay_candidate_validator_ozone.cc b/content/browser/compositor/overlay_candidate_validator_ozone.cc
index 367e7761461d07fc84632e43d5fd90cd4b3aed27..7ca5a97b2c8d794857b1e8620e75fd7c344ea253 100644
--- a/content/browser/compositor/overlay_candidate_validator_ozone.cc
+++ b/content/browser/compositor/overlay_candidate_validator_ozone.cc
@@ -17,11 +17,11 @@ static gfx::SurfaceFactoryOzone::BufferFormat GetOzoneFormat(
     case cc::BGRA_8888:
     case cc::LUMINANCE_8:
     case cc::RGB_565:
-    case cc::ETC1: {
-      NOTREACHED();
-      return gfx::SurfaceFactoryOzone::UNKNOWN;
-    }
+    case cc::ETC1:
+      break;
   }
+  NOTREACHED();
+  return gfx::SurfaceFactoryOzone::UNKNOWN;
 }
 
 OverlayCandidateValidatorOzone::OverlayCandidateValidatorOzone(