CUPS Printing: Extend and enable AdvancedPPDAttributes feature flag

Bug: 964919
Change-Id: I2122c17fac16f0ba01995402cf4a00fca15a31a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978010Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726987}

chrome/browser/flag-metadata.json

@@ -890,7 +890,7 @@
   {
     "name": "enable-advanced-ppd-attributes",
     "owners": [ "vkuzkokov", "skau" ],
-    "expiry_milestone": 80
+    "expiry_milestone": 83
   },
   {
     "name": "enable-ambient-authentication-in-guest-session",

printing/printing_features_chromeos.cc

@@ -8,6 +8,6 @@ namespace printing {
 
 // Enables Advanced PPD Attributes.
 const base::Feature kAdvancedPpdAttributes{"AdvancedPpdAttributes",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace printing