[Sync] Remove some http-related chrome deps from SyncBackendHostImpl.

chrome/browser/sync/profile_sync_service_startup_unittest.cc

Index: chrome/browser/sync/profile_sync_service_startup_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_startup_unittest.cc b/chrome/browser/sync/profile_sync_service_startup_unittest.cc
index 95c5ca042274e030035e3698d62e4c94b22371b2..54e38a1276febb43719410114fe7b26ab51afd51 100644
--- a/chrome/browser/sync/profile_sync_service_startup_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_startup_unittest.cc
@@ -88,7 +88,8 @@ class TestProfileSyncServiceNoBackup : public ProfileSyncService {
                            profile,
                            signin_wrapper.Pass(),
                            oauth2_token_service,
-                           start_behavior) {}
+                           start_behavior,
+                           base::Bind(&EmptyNetworkTimeUpdate)) {}
 
  protected:
   bool NeedBackup() const override { return false; }