Mojo: Rename (Mojo)WaitFlagsState -> (Mojo)HandleSignalsState.

mojo/system/local_message_pipe_endpoint.h

Index: mojo/system/local_message_pipe_endpoint.h
diff --git a/mojo/system/local_message_pipe_endpoint.h b/mojo/system/local_message_pipe_endpoint.h
index e30aff42dfc91621e9ed97e58057bb0b29bd03ac..4e59cfbc4211b32369778db3f23640d6da719618 100644
--- a/mojo/system/local_message_pipe_endpoint.h
+++ b/mojo/system/local_message_pipe_endpoint.h
@@ -7,10 +7,10 @@
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "mojo/system/handle_signals_state.h"
 #include "mojo/system/message_in_transit_queue.h"
 #include "mojo/system/message_pipe_endpoint.h"
 #include "mojo/system/system_impl_export.h"
-#include "mojo/system/wait_flags_state.h"
 #include "mojo/system/waiter_list.h"
 
 namespace mojo {
@@ -45,7 +45,7 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint
   MessageInTransitQueue* message_queue() { return &message_queue_; }
 
  private:
-  WaitFlagsState GetWaitFlagsState();
+  HandleSignalsState GetHandleSignalsState();
 
   bool is_open_;
   bool is_peer_open_;