chromeos: Disable SplitSettingsSync by default

We're moving the launch to M-85.

Bug: 1013466
Change-Id: I864d118f8b79e7c564477c4cf7a0731e9c4982aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2183169Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766519}

chromeos/constants/chromeos_features.cc

@@ -353,7 +353,7 @@ const base::Feature kSmartDimModelV3{"SmartDimModelV3",
 // For example, the user could choose to sync OS settings but not browser
 // settings.
 const base::Feature kSplitSettingsSync{"SplitSettingsSync",
-                                       base::FEATURE_ENABLED_BY_DEFAULT};
+                                       base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Introduces a new OOBE dialog for the OS sync feature. Uses the same browser
 // sync consent dialog as Windows/Mac/Linux. Allows the user to fully opt-out of