Disable tab syncing when history saving is disabled.

chrome/browser/sync/sessions/session_data_type_controller.h

Index: chrome/browser/sync/sessions/session_data_type_controller.h
diff --git a/chrome/browser/sync/sessions/session_data_type_controller.h b/chrome/browser/sync/sessions/session_data_type_controller.h
index 3ba97f45ae1d5a9a3d7a819e644984fb9e46da55..670222bc244709f32c1e14d360fa3d4643eb7b68 100644
--- a/chrome/browser/sync/sessions/session_data_type_controller.h
+++ b/chrome/browser/sync/sessions/session_data_type_controller.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_SYNC_SESSIONS_SESSION_DATA_TYPE_CONTROLLER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_SESSION_DATA_TYPE_CONTROLLER_H_
 
+#include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/sync/glue/local_device_info_provider.h"
 #include "components/sync_driver/ui_data_type_controller.h"
 #include "content/public/browser/notification_observer.h"
@@ -34,6 +35,8 @@ class SessionDataTypeController : public sync_driver::UIDataTypeController,
 
  protected:
   virtual ~SessionDataTypeController();
+  virtual void LoadModels(const ModelLoadCallback& model_load_callback)

[Andrew T Wilson (Slow), 2014/08/21 14:10:37]

Please don't change visibility of APIs in subclasses.

[Joao da Silva, 2014/08/26 16:06:52]

Done.

+      OVERRIDE;
   virtual bool StartModels() OVERRIDE;
   virtual void StopModels() OVERRIDE;
 
@@ -41,6 +44,7 @@ class SessionDataTypeController : public sync_driver::UIDataTypeController,
   bool IsWaiting();
   void MaybeCompleteLoading();
   void OnLocalDeviceInfoInitialized();
+  void OnSavingBrowserHistoryPrefChanged();
 
   Profile* const profile_;
 
@@ -54,10 +58,11 @@ class SessionDataTypeController : public sync_driver::UIDataTypeController,
   bool waiting_on_session_restore_;
   bool waiting_on_local_device_info_;
 
+  PrefChangeRegistrar pref_registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(SessionDataTypeController);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSION_DATA_TYPE_CONTROLLER_H_
-