Remove unused SWD metric ota_result_free_space_delta.

Bug: 74590
Change-Id: Idd5763a70fa7e816388f3c653e8135cb0b38fd65
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt-registry/+/646083
Fuchsia-Auto-Submit: Cameron Dale <camrdale@google.com>
Privacy-Approval: Cameron Dale <camrdale@google.com>
Reviewed-by: Ben Keller <galbanum@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/fuchsia/software_delivery/metrics.yaml b/fuchsia/software_delivery/metrics.yaml
index 70a0dcd..24a6d03 100644
--- a/fuchsia/software_delivery/metrics.yaml
+++ b/fuchsia/software_delivery/metrics.yaml
@@ -313,40 +313,6 @@
 
 
 ################################################################################
-# OTA Result Free-Space Delta
-#
-# Used to log the delta between the free space after the OTA and the free space
-# before the OTA, at the point that update was applied and is ready to be
-# booted, or an error was encountered during the update attempt
-################################################################################
-- id: 5
-  no_replacement_metric: Cannot log an integer and a component string in the same metric in Cobalt 1.1
-  metric_name: ota_result_free_space_delta
-  metric_type: EVENT_COUNT
-  metric_dimensions:
-      # What initiated the update check?
-    - dimension: initiator
-      event_codes:
-        0: AutomaticUpdateCheck
-        1: UserInitiatedCheck
-      # At which phase did the update terminate?
-    - dimension: phase
-      event_codes: *ota_result_termination_phases
-    - dimension: status_code
-      event_codes: *ota_result_status_codes
-  reports:
-    - report_name: ota_result_free_space_delta_stats
-      id: 4160859516 # legacy long report_id
-      report_type: NUMERIC_AGGREGATION
-      # The |component| string is used to capture the target build version
-      candidate_file: fuchsia/software_delivery/build_versions.txt
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME]
-  meta_data:
-    max_release_stage: GA
-    expiration_date: "2022/03/30"
-
-
-################################################################################
 # Fetch Blob Result
 #
 # Used to log a 1 every time fetch_blob is called. fetch_blob is called when