Deprecate NonThreadSafe in components/invalidation in favor of SequenceChecker.

components/invalidation/impl/sync_invalidation_listener.h

Index: components/invalidation/impl/sync_invalidation_listener.h
diff --git a/components/invalidation/impl/sync_invalidation_listener.h b/components/invalidation/impl/sync_invalidation_listener.h
index 3ed6cb97313ca13848d98d840ed56c5e5a0eb5ae..85bc467fcfaf8505e4b70ea8b77390ed71bdffba 100644
--- a/components/invalidation/impl/sync_invalidation_listener.h
+++ b/components/invalidation/impl/sync_invalidation_listener.h
@@ -15,7 +15,7 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/invalidation/impl/invalidation_state_tracker.h"
 #include "components/invalidation/impl/state_writer.h"
 #include "components/invalidation/impl/sync_system_resources.h"
@@ -36,8 +36,7 @@ class INVALIDATION_EXPORT SyncInvalidationListener
     : public NON_EXPORTED_BASE(invalidation::InvalidationListener),
       public StateWriter,
       public SyncNetworkChannel::Observer,
-      public AckHandler,
-      public base::NonThreadSafe {
+      public AckHandler {
  public:
   typedef base::Callback<invalidation::InvalidationClient*(
       invalidation::SystemResources*,
@@ -174,6 +173,8 @@ class INVALIDATION_EXPORT SyncInvalidationListener
   InvalidatorState ticl_state_;
   InvalidatorState push_client_state_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<SyncInvalidationListener> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncInvalidationListener);