Create Finch config for non-syncing signed-in user.

Create experiment for SafeBrowsingPasswordProtectionForSignedInUsers.

Bug: 914410
Change-Id: Iae3e6d2b74419048e1a78eb0479bed1d6446282e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809899Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697665}

testing/variations/fieldtrial_testing_config.json

@@ -5183,6 +5183,24 @@
             ]
         }
     ],
+    "SafeBrowsingPasswordProtectionForSignedInUsers": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SafeBrowsingPasswordProtectionForSignedInUsers"
+                    ]
+                }
+            ]
+        }
+    ],
     "SafeBrowsingScoutTransitionStudy": [
         {
             "platforms": [