[M135] Disable FledgeBiddingAndAuctionNonceSupport feature by default.

This feature has not received the necessary launch approvals yet, so is no longer eligible for a waterfall launch.

(cherry picked from commit 54bf9b3e48)

Change-Id: I8bf1ccfd29c1ea3ed16517343787fb23519b45a4
Bug: 385128725, 402187922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6337594
Reviewed-by: Qingxin Wu <qingxinwu@google.com>
Commit-Queue: Russ Hamilton <behamilton@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1430421}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6347074
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7049@{#557}
Cr-Branched-From: 2dab7846d0951a552bdc4f350dad497f986e6fed-refs/heads/main@{#1427262}

content/browser/interest_group/interest_group_features.cc

@@ -40,7 +40,7 @@ BASE_FEATURE(kEnableBandATriggeredUpdates,
 // Enable response authorization using the Ad-Auction-Result-Nonce header.
 BASE_FEATURE(kFledgeBiddingAndAuctionNonceSupport,
              "FledgeBiddingAndAuctionNonceSupport",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Enable un-noised real time reporting for certain user settings.
 BASE_FEATURE(kFledgeEnableUnNoisedRealTimeReport,

testing/variations/fieldtrial_testing_config.json

@@ -10093,6 +10093,25 @@
             ]
         }
     ],
+    "FledgeBiddingAndAuctionNonceSupport": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows",
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "FledgeBiddingAndAuctionNonceSupport"
+                    ]
+                }
+            ]
+        }
+    ],
     "Floss": [
         {
             "platforms": [