Enable ArcPreImeKeyEventSupport by default.

Bug: b:148193316
Test: tast run arc.PreImeKeyEvent
Change-Id: I8ba1437e5a94f3a251d9a7e658df2d995ddd3dec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391184Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804664}

chromeos/constants/chromeos_features.cc

@@ -45,8 +45,8 @@ const base::Feature kArcManagedAdbSideloadingSupport{
     "ArcManagedAdbSideloadingSupport", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Controls whether to enable support for View.onKeyPreIme() of ARC apps.
-const base::Feature kArcPreImeKeyEventSupport{
-    "ArcPreImeKeyEventSupport", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kArcPreImeKeyEventSupport{"ArcPreImeKeyEventSupport",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables auto screen-brightness adjustment when ambient light
 // changes.