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

chrome/browser/sync/profile_sync_test_util.h

Index: chrome/browser/sync/profile_sync_test_util.h
diff --git a/chrome/browser/sync/profile_sync_test_util.h b/chrome/browser/sync/profile_sync_test_util.h
index 7062907c3dfa7a489eabac383585afe3eb7bcded..c884d1de06fa7b99ab6a3af72e683591d941515d 100644
--- a/chrome/browser/sync/profile_sync_test_util.h
+++ b/chrome/browser/sync/profile_sync_test_util.h
@@ -19,8 +19,16 @@
 
 namespace base {
 class Thread;
+class Time;
+class TimeDelta;
 }
 
+// An empty syncer::NetworkTimeUpdateCallback. Used in various tests to
+// instantiate ProfileSyncService.
+void EmptyNetworkTimeUpdate(const base::Time&,
+                            const base::TimeDelta&,
+                            const base::TimeDelta&);
+
 ACTION_P(Notify, type) {
   content::NotificationService::current()->Notify(
       type,