[Passwords] Enable Password Weakness Check By Default

This change enables the PasswordsWeaknessCheck feature by default and
removes the corresponding field trial testing config.

Bug: 1119752
Change-Id: I8e0908f796a56c7eed3bc8945b7c741f15a14838
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637574Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844756}

components/password_manager/core/common/password_manager_features.cc

@@ -89,7 +89,7 @@ const base::Feature kPasswordScriptsFetching = {
 
 // Enables checking credentials for weakness in Password Check.
 const base::Feature kPasswordsWeaknessCheck = {
-    "PasswordsWeaknessCheck", base::FEATURE_DISABLED_BY_DEFAULT};
+    "PasswordsWeaknessCheck", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables showing UI which allows users to easily revert their choice to
 // never save passwords on a certain website.

testing/variations/fieldtrial_testing_config.json

@@ -5056,24 +5056,6 @@
             ]
         }
     ],
-    "PasswordsWeaknessCheck": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "PasswordsWeaknessCheck"
-                    ]
-                }
-            ]
-        }
-    ],
     "PaymentRequestAlwaysAllowJustInTimePaymentApp": [
         {
             "platforms": [