Enable TerminalSystemApp by default on trunk (M83 dev)

Change-Id: I7c64fc381870279c1efb7810a3c5112e973e8e7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108261
Commit-Queue: Jason Lin <lxj@google.com>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Jason Lin <lxj@google.com>
Cr-Commit-Position: refs/heads/master@{#751553}

chrome/common/chrome_features.cc

@@ -185,7 +185,7 @@ const base::Feature kPrintServerUi{"PrintServerUi",
 // OS_CHROMEOS, but this flag must be defined for all platforms since
 // it is required for SystemWebApp tests.
 const base::Feature kTerminalSystemApp{"TerminalSystemApp",
-                                       base::FEATURE_DISABLED_BY_DEFAULT};
+                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Use the Terminal System App legacy settings page.
 const base::Feature kTerminalSystemAppLegacySettings{