arc: Enable print-spooler-experiment feature flag by default

Also, enable the flag for all channels except stable.

Bug: b:130798103
Test: android-sh -c getprop | grep ro.boot.arc_print_spooler
Change-Id: I4ca45c248737bbc0e5c90ed679bfe2b77ec9ed12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784006Reviewed-by: Elijah Taylor <elijahtaylor@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693860}

components/arc/arc_features.cc

@@ -62,7 +62,7 @@ const base::Feature kPictureInPictureFeature{"ArcPictureInPicture",
 
 // Controls experimental print spooler feature for ARC.
 const base::Feature kPrintSpoolerExperimentFeature{
-    "ArcPrintSpoolerExperiment", base::FEATURE_DISABLED_BY_DEFAULT};
+    "ArcPrintSpoolerExperiment", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Controls Smart Text Selection for Chrome.
 // When enabled, the context menu will show contextual quick actions based on

components/arc/session/arc_session_impl.cc

@@ -376,8 +376,7 @@ void ArcSessionImpl::OnLcdDensity(int32_t lcd_density) {
   request.set_arc_custom_tabs_experiment(is_custom_tab_enabled);
   const bool is_arc_print_spooler_enabled =
       base::FeatureList::IsEnabled(arc::kPrintSpoolerExperimentFeature) &&
-      delegate_->GetChannel() != version_info::Channel::STABLE &&
-      delegate_->GetChannel() != version_info::Channel::BETA;
+      delegate_->GetChannel() != version_info::Channel::STABLE;
   request.set_arc_print_spooler_experiment(is_arc_print_spooler_enabled);
   request.set_lcd_density(lcd_density);