Removed "disable-first-run-ui" flag and switch.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index c97eaafdbdac8015494f10c9b9666d7bd067b25c..76539b7420827aa01addde630eec2ff60292bcc6 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6293,12 +6293,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
         </message>
       </if>
       <if expr="chromeos">
-        <message name="IDS_FLAGS_DISABLE_FIRST_RUN_UI_NAME" desc="Name of the flag to disable new first-run UI.">
-          Disable new first-run UI.
-        </message>
-        <message name="IDS_FLAGS_DISABLE_FIRST_RUN_UI_DESCRIPTION" desc="Description for the flag to disable new first-run UI.">
-          If disabled, overlay tutorial won't be shown after first sign-in.
-        </message>
         <message name="IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_NAME" desc="Name of the flag to enable animated transitions for the first-run tutorial.">
           Enable animated transitions in the first-run tutorial.
         </message>