[DeviceSync v2] Enable v2 DeviceSync flag by default

CryptAuth v2 DeviceSync is currently rolled out to 65% on stable
channel (cl/339923041). According to best practices, the flag should be
enabled by default once stable population is at 50% or higher.

We also clean up the field trial testing configs for v2 DeviceSync as
well as v2 Enrollment which already launched.

Bug: 951969
Change-Id: I0b6293000da8f45018984b1ea3cdfc48ed7cd9f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515842
Commit-Queue: Josh Nohle <nohle@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#823446}

chromeos/constants/chromeos_features.cc

@@ -201,7 +201,7 @@ const base::Feature kCryptAuthV2DeviceActivityStatus{
 // flag, v1 DeviceSync will continue to operate until it is disabled via the
 // feature flag kDisableCryptAuthV1DeviceSync.
 const base::Feature kCryptAuthV2DeviceSync{"CryptAuthV2DeviceSync",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables the CryptAuth v2 Enrollment flow.
 const base::Feature kCryptAuthV2Enrollment{"CryptAuthV2Enrollment",
@@ -488,7 +488,7 @@ const base::Feature kPrintSaveToDrive{"PrintSaveToDrive",
 
 // Allows print servers to be selected when beyond a specified limit.
 const base::Feature kPrintServerScaling{"PrintServerScaling",
-                                      base::FEATURE_DISABLED_BY_DEFAULT};
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Controls whether to enable quick answers.
 const base::Feature kQuickAnswers{"QuickAnswers",

testing/variations/fieldtrial_testing_config.json

@@ -1988,36 +1988,6 @@
             ]
         }
     ],
-    "CryptAuthV2DeviceSync": [
-        {
-            "platforms": [
-                "chromeos"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled_20200427",
-                    "enable_features": [
-                        "CryptAuthV2DeviceSync"
-                    ]
-                }
-            ]
-        }
-    ],
-    "CryptAuthV2Enrollment": [
-        {
-            "platforms": [
-                "chromeos"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "CryptAuthV2Enrollment"
-                    ]
-                }
-            ]
-        }
-    ],
     "CupsIppPrintingBackend": [
         {
             "platforms": [