Enable Crostini Upgrade WebUI by default

Bug: 1024693
Change-Id: Ie2c40ad0c6050cf8d2be19ee50b7ea9e030b2d44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055907Reviewed-by: David Munro <davidmunro@google.com>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741357}

chromeos/constants/chromeos_features.cc

@@ -77,7 +77,7 @@ const base::Feature kCrostiniUsbAllowUnsupported{
 
 // Enables or disables the new WebUI Crostini upgrader.
 const base::Feature kCrostiniWebUIUpgrader{"CrostiniWebUIUpgrader",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables using Cryptauth's GetDevicesActivityStatus API.
 const base::Feature kCryptAuthV2DeviceActivityStatus{