[EmojiSuggest] Enable by default

We are going ahead with rolling out to 100% of users so enable feature
by default

Bug: 1049826
Change-Id: I9e838844a0323e502ba79d4f5a706f285081eea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581624Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835876}

chromeos/constants/chromeos_features.cc

@@ -266,7 +266,7 @@ const base::Feature kDriveFsMirroring{"DriveFsMirroring",
 
 // If enabled, emoji suggestion will be shown when user type "space".
 const base::Feature kEmojiSuggestAddition{"EmojiSuggestAddition",
-                                          base::FEATURE_DISABLED_BY_DEFAULT};
+                                          base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables setting the device hostname.
 const base::Feature kEnableHostnameSetting{"EnableHostnameSetting",