Print Preview: Move Privet printing behind a flag

Privet printing is deprecated. Move it behind a flag that is disabled
by default. Remove warnings that refer to December 2020, as all
cloud and privet printing is now either removed or disabled by default,
and M88 will be released in 2021.

[email protected]

Bug: 1112576
Change-Id: If86cdea73382bff36ed9a425fdf65d642f4a0907
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528935
Commit-Queue: Rebekah Potter <[email protected]>
Reviewed-by: dpapad <[email protected]>
Reviewed-by: Daniel Hosseinian <[email protected]>
Cr-Commit-Position: refs/heads/master@{#826761}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 7f2d942..daed4b37 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -1830,6 +1830,11 @@
     "Redesign of the privacy settings card to make it more prominent and "
     "and easier to use.";
 
+const char kForceEnablePrivetPrintingName[] = "Force enable Privet Printing";
+const char kForceEnablePrivetPrintingDescription[] =
+    "Override to force enabling printing to existing registered Privet "
+    "printers in Print Preview. Will be removed in M90.";
+
 const char kSafetyCheckAndroidName[] = "Safety Check on Android";
 const char kSafetyCheckAndroidDescription[] =
     "A settings component for checking multiple areas of browser safety. "