Reuse one UserPolicySigninService for Android and iOS.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index cf188b68561d939c59b2b97f562c903f00576b45..897c97d87cd8579ea832c0f6bf3cb6bb751f761d 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -471,14 +471,12 @@ const char kAlternateProtocolServers[] = "spdy.alternate_protocol";
 // Disables the listed protocol schemes.
 const char kDisabledSchemes[] = "protocol.disabled_schemes";
 
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || defined(OS_IOS)
 // Last time that a check for cloud policy management was done. This time is
 // recorded on Android so that retries aren't attempted on every startup.
 // Instead the cloud policy registration is retried at least 1 or 3 days later.
 const char kLastPolicyCheckTime[] = "policy.last_policy_check_time";
-#endif
 
-#if defined(OS_ANDROID) || defined(OS_IOS)
 // A list of bookmarks to include in a Managed Bookmarks root node. Each
 // list item is a dictionary containing a "name" and an "url" entry, detailing
 // the bookmark name and target URL respectively.