Enable hiding user data in Android notifications.

Removal of user data from Android Media and WebRTC notifications is
enabled.

Bug: 629887
Change-Id: Iafda3010a7b0079e7220be2fbca0d67522a75407
Reviewed-on: https://chromium-review.googlesource.com/c/1278626Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599578}

chrome/browser/android/chrome_feature_list.cc

@@ -310,8 +310,7 @@ const base::Feature kHandleMediaIntents{"HandleMediaIntents",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kHideUserDataFromIncognitoNotifications{
-    "HideUserDataFromIncognitoNotifications",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    "HideUserDataFromIncognitoNotifications", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kHomePageButtonForceEnabled{
     "HomePageButtonForceEnabled", base::FEATURE_DISABLED_BY_DEFAULT};