sync: Remove unused private fields

To avoid having a lot of -Wunused-private-field warnings when using "=delete" to implement DISALLOW_COPY_AND_ASSIGN.

BUG=447445

Review URL: https://codereview.chromium.org/824893004

Cr-Commit-Position: refs/heads/master@{#310766}

sync/internal_api/http_bridge.cc

@@ -135,8 +135,7 @@ HttpBridge::RequestContext::RequestContext(
     const scoped_refptr<base::SingleThreadTaskRunner>&
         network_task_runner,
     const std::string& user_agent)
-    : baseline_context_(baseline_context),
-      network_task_runner_(network_task_runner),
+    : network_task_runner_(network_task_runner),
       job_factory_(new net::URLRequestJobFactoryImpl()) {
   DCHECK(!user_agent.empty());
 

sync/internal_api/public/http_bridge.h

@@ -71,7 +71,6 @@ class SYNC_EXPORT_PRIVATE HttpBridge
     ~RequestContext() override;
 
    private:
-    net::URLRequestContext* const baseline_context_;
     const scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
     scoped_ptr<net::HttpUserAgentSettings> http_user_agent_settings_;
     scoped_ptr<net::URLRequestJobFactory> job_factory_;

sync/sessions/model_type_registry.h

@@ -138,9 +138,6 @@ class SYNC_EXPORT_PRIVATE ModelTypeRegistry
   // The set of encrypted types.
   ModelTypeSet encrypted_types_;
 
-  // A helper that manages cryptography state and preferences.
-  SyncEncryptionHandler* encryption_handler_;
-
   // The NudgeHandler.  Not owned.
   NudgeHandler* nudge_handler_;
 

sync/sessions/nudge_tracker.h

@@ -159,10 +159,6 @@ class SYNC_EXPORT_PRIVATE NudgeTracker {
   TypeTrackerMap type_trackers_;
   STLValueDeleter<TypeTrackerMap> type_tracker_deleter_;
 
-  // Merged updates source.  This should be obsolete, but the server still
-  // relies on it for some heuristics.
-  sync_pb::GetUpdatesCallerInfo::GetUpdatesSource updates_source_;
-
   // Tracks whether or not invalidations are currently enabled.
   bool invalidations_enabled_;
 
@@ -177,8 +173,6 @@ class SYNC_EXPORT_PRIVATE NudgeTracker {
   // enabled, then complete a sync cycle to make sure we're fully up to date.
   bool invalidations_out_of_sync_;
 
-  size_t num_payloads_per_type_;
-
   base::TimeTicks last_successful_sync_time_;
 
   // A pending update to the current_retry_time_.