[ios] Enable AddWebContentDropInteraction by default TOT

Bug: 1099646
Change-Id: Ie8fb8ef1a281b9b170f9ea49ad2e799f14bd7375
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567477Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832425}

ios/web/common/features.mm

@@ -42,7 +42,7 @@ const base::Feature kPreserveScrollViewProperties{
     "PreserveScrollViewProperties", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kAddWebContentDropInteraction{
-    "AddWebContentDropInteraction", base::FEATURE_DISABLED_BY_DEFAULT};
+    "AddWebContentDropInteraction", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kScrollToTextIOS{"ScrollToTextIOS",
                                      base::FEATURE_DISABLED_BY_DEFAULT};

testing/variations/fieldtrial_testing_config.json

@@ -3536,21 +3536,6 @@
             ]
         }
     ],
-    "IOSWebContentDropInteraction": [
-        {
-            "platforms": [
-                "ios"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "AddWebContentDropInteraction"
-                    ]
-                }
-            ]
-        }
-    ],
     "Identifiability": [
         {
             "platforms": [