cros: Enable country customization in Demo Mode by default

Bug: 888733
Change-Id: I2b847b2a37f666a688336036f02ea08111f5f525
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496523
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637880}

chromeos/constants/chromeos_switches.cc

@@ -53,7 +53,7 @@ const base::Feature kShowSplashScreenInDemoMode{
     "ShowSplashScreenInDemoMode", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kSupportCountryCustomizationInDemoMode{
-    "SupportCountryCustomizationInDemoMode", base::FEATURE_DISABLED_BY_DEFAULT};
+    "SupportCountryCustomizationInDemoMode", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Please keep the order of these switches synchronized with the header file
 // (i.e. in alphabetical order).