[Fixit] Deprecate QueryTiles model

OBSOLETE_HISTOGRAMS="Deprecating segmentation usage for query tiles."

Change-Id: If40915913bd5aa31cf1dd9b64b47dcf35155f6a6
Bug: b/299529649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4923085
Reviewed-by: Tomasz Wiszkowski <[email protected]>
Code-Coverage: [email protected] <[email protected]>
Reviewed-by: Siddhartha S <[email protected]>
Reviewed-by: Calder Kitagawa <[email protected]>
Commit-Queue: Ritika Gupta <[email protected]>
Reviewed-by: Min Qin <[email protected]>
Reviewed-by: Shakti Sahu <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1236954}
diff --git a/components/segmentation_platform/internal/segmentation_ukm_helper.cc b/components/segmentation_platform/internal/segmentation_ukm_helper.cc
index a41a83f..77c85c634 100644
--- a/components/segmentation_platform/internal/segmentation_ukm_helper.cc
+++ b/components/segmentation_platform/internal/segmentation_ukm_helper.cc
@@ -167,8 +167,7 @@
         SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_NEW_TAB,
         SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_SHARE,
         SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_VOICE,
-        SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_DUMMY,
-        SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_QUERY_TILES};
+        SegmentId::OPTIMIZATION_TARGET_SEGMENTATION_DUMMY};
   }
   sampling_rate_ = GetModelExecutionSamplingRate();
   DCHECK_GE(sampling_rate_, 0);