Remove safe_browsing=2 functionality, replace with =3 mode.

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
diff --git a/chrome/browser/safe_browsing/protocol_manager.h b/chrome/browser/safe_browsing/protocol_manager.h
index e8bb43f0745564afd3da704704dd561e279b3247..bfbd2c1f8abd993d2cea4e1d0dd9c3545215ee05 100644
--- a/chrome/browser/safe_browsing/protocol_manager.h
+++ b/chrome/browser/safe_browsing/protocol_manager.h
@@ -377,12 +377,6 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   // ForceScheduleNextUpdate() is called. This is set for testing purpose.
   bool disable_auto_update_;
 
-#if defined(OS_ANDROID)
-  // When true, protocol_manager will not check network connection
-  // type when scheduling next update. This is set for testing purpose.
-  bool disable_connection_check_;
-#endif
-
   // ID for URLFetchers for testing.
   int url_fetcher_id_;