Convert base::Callback to base::RepeatingCallback in ios/net

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40


Bug: 1007794
Change-Id: I6ce90efd8b8e29514c58e866316e84e487c324d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500442Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Renjie Tang <renjietang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821299}

ios/net/clients/crn_network_client_protocol.h

@@ -15,12 +15,6 @@ class AuthChallengeInfo;
 class URLRequest;
 }  // namespace net
 
-namespace network_client {
-typedef base::Callback<void(bool auth_ok,
-                            const base::string16& username,
-                            const base::string16& password)> AuthCallback;
-}  // namespace network_client
-
 // CRNNetworkClientProtocol provides an interface for delegate classes that
 // receive calls about data loading from the Chromium network stack.
 // Many methods in this protocol correspond to the NSURLProtocol methods, and

ios/net/http_cache_helper.cc

@@ -71,7 +71,8 @@ void ClearHttpCacheOnIOThread(
   // Clear QUIC server information from memory and the disk cache.
   http_cache->GetSession()
       ->quic_stream_factory()
-      ->ClearCachedStatesInCryptoConfig(base::Callback<bool(const GURL&)>());
+      ->ClearCachedStatesInCryptoConfig(
+          base::RepeatingCallback<bool(const GURL&)>());
 
   std::unique_ptr<disk_cache::Backend*> backend(
       new disk_cache::Backend*(nullptr));