[BREFs/Storage Partitioning] Enable deprecation origin trial

This CL alters the DisableThirdPartyStoragePartitioning runtime-enabled
feature to create a deprecation origin trial of the same name.

It also removes an old runtime feature that is no longer is use with the incorrect naming.

Bug: 1404959
Change-Id: Idd3fe3ba702a2a49fb1cf355c2ac6eb96db1523c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4195094
Reviewed-by: Mike Taylor <miketaylr@chromium.org>
Commit-Queue: Mike Taylor <miketaylr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1098127}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1091,6 +1091,9 @@
     // on their site.
     {
       name: "DisableThirdPartyStoragePartitioning",
+      origin_trial_feature_name: "DisableThirdPartyStoragePartitioning",
+      origin_trial_type: "deprecation",
+      origin_trial_allows_insecure: true,
       status: "experimental",
       browser_process_read_write_access: true,
     },
@@ -2828,13 +2831,6 @@
       name: "TextFragmentTapOpensContextMenu",
       status: {"Android": "stable"},
     },
-    // To enable the deprecation trial, use the
-    // `DisableThirdPartyStoragePartitioning` feature instead.
-    {
-      name: "ThirdPartyStoragePartitioning",
-      status: "experimental",
-      browser_process_read_write_access: true,
-    },
     {
       name: "TimerThrottlingForBackgroundTabs",
       public: true,