Set CoreSchedulingEnabled to default enable

Core-scheduling tests have completed and is stable/performant. Make it
default enabled.

Finch experiment will be set to launch process.

Bug: b:152605392
Signed-off-by: Joel Fernandes <joelaf@google.com>
Change-Id: I902e282b23cb95b2f78bf52042fdc5f76aa959c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584608Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835779}

chromeos/system/core_scheduling.cc

@@ -22,7 +22,7 @@ namespace system {
 
 namespace {
 const base::Feature kCoreScheduling{"CoreSchedulingEnabled",
-                                    base::FEATURE_DISABLED_BY_DEFAULT};
+                                    base::FEATURE_ENABLED_BY_DEFAULT};
 }
 
 void EnableCoreSchedulingIfAvailable() {