[ShareButtonInTopToolbar] match finch experiment params.

Bug: 1036023
Change-Id: Ic76a51834f2fd1635e768a6974b95db5a6cbda07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151466
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759428}

testing/variations/fieldtrial_testing_config.json

@@ -5309,6 +5309,9 @@
             "experiments": [
                 {
                     "name": "Enabled",
+                    "params": {
+                        "minimum_width": "360"
+                    },
                     "enable_features": [
                         "ShareButtonInTopToolbar"
                     ]