Fix WeakPtrFactory member ordering in chrome/browser and chrome/service

chrome/browser/sessions/base_session_service.h

Index: chrome/browser/sessions/base_session_service.h
diff --git a/chrome/browser/sessions/base_session_service.h b/chrome/browser/sessions/base_session_service.h
index 98f237955ac9376265e204a66c56a38518b2fdb6..527ca404a6d0c19c5cf4ca873d86d1da400d767a 100644
--- a/chrome/browser/sessions/base_session_service.h
+++ b/chrome/browser/sessions/base_session_service.h
@@ -171,9 +171,6 @@ class BaseSessionService {
   // The backend.
   scoped_refptr<SessionBackend> backend_;
 
-  // Used to invoke Save.
-  base::WeakPtrFactory<BaseSessionService> weak_factory_;
-
   // Commands we need to send over to the backend.
   std::vector<SessionCommand*>  pending_commands_;
 
@@ -187,6 +184,9 @@ class BaseSessionService {
   // A token to make sure that all tasks will be serialized.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 
+  // Used to invoke Save.
+  base::WeakPtrFactory<BaseSessionService> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BaseSessionService);
 };