[Android] Enable SyncErrorInfoBarAndroid in fieldtrial_testing_config.json

Enable SyncErrorInfoBar in preparation for release to Stable.

Bug: 1046765
Change-Id: Iacf88d41dba2eb7aff6d660cc5354407cc5353d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224266
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775074}

testing/variations/fieldtrial_testing_config.json

@@ -6005,6 +6005,21 @@
             ]
         }
     ],
+    "SyncErrorInfoBarTesting": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SyncErrorInfoBarAndroid"
+                    ]
+                }
+            ]
+        }
+    ],
     "SyncInstanceIDTokenTTL": [
         {
             "platforms": [