[AF] Fixes migration of the kAutofillEnabledDeprecated pref

The migration was added for Android only by mistake (crrev.com/c/1194598)

Bug: 870328,877801
Change-Id: Ie21b24ce67ef437dfa60755a5ec9ce03d5eb2661
Reviewed-on: https://chromium-review.googlesource.com/1213548Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589565}

chrome/browser/prefs/browser_prefs.cc

@@ -795,10 +795,10 @@ void MigrateObsoleteProfilePrefs(Profile* profile) {
 
   // Added 5/2018
   profile_prefs->ClearPref(kDismissedRecentOfflineTabSuggestions);
+#endif  // defined(OS_ANDROID)
 
   // Added 8/2018.
   autofill::prefs::MigrateDeprecatedAutofillPrefs(profile_prefs);
-#endif  // defined(OS_ANDROID)
 
   // Added 8/2018
   profile_prefs->ClearPref(kDnsPrefetchingStartupList);