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

mojo/system/data_pipe.h

Index: mojo/system/data_pipe.h
diff --git a/mojo/system/data_pipe.h b/mojo/system/data_pipe.h
index 20a7b5ad58f506dbee386f0bf74b63d91a162684..2cab507e4625906e6d6de785a8ae9d10eecb27aa 100644
--- a/mojo/system/data_pipe.h
+++ b/mojo/system/data_pipe.h
@@ -13,8 +13,8 @@
 #include "base/synchronization/lock.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/types.h"
+#include "mojo/system/handle_signals_state.h"
 #include "mojo/system/system_impl_export.h"
-#include "mojo/system/wait_flags_state.h"
 
 namespace mojo {
 namespace system {
@@ -108,7 +108,7 @@ class MOJO_SYSTEM_IMPL_EXPORT DataPipe :
   virtual MojoResult ProducerEndWriteDataImplNoLock(
       uint32_t num_bytes_written) = 0;
   // Note: A producer should not be writable during a two-phase write.
-  virtual WaitFlagsState ProducerGetWaitFlagsStateNoLock() const = 0;
+  virtual HandleSignalsState ProducerGetHandleSignalsStateNoLock() const = 0;
 
   virtual void ConsumerCloseImplNoLock() = 0;
   // |*num_bytes| will be a nonzero multiple of |element_num_bytes_|.
@@ -124,7 +124,7 @@ class MOJO_SYSTEM_IMPL_EXPORT DataPipe :
                                                      bool all_or_none) = 0;
   virtual MojoResult ConsumerEndReadDataImplNoLock(uint32_t num_bytes_read) = 0;
   // Note: A consumer should not be writable during a two-phase read.
-  virtual WaitFlagsState ConsumerGetWaitFlagsStateNoLock() const = 0;
+  virtual HandleSignalsState ConsumerGetHandleSignalsStateNoLock() const = 0;
 
   // Thread-safe and fast (they don't take the lock):
   bool may_discard() const { return may_discard_; }
@@ -168,9 +168,9 @@ class MOJO_SYSTEM_IMPL_EXPORT DataPipe :
 
  private:
   void AwakeProducerWaitersForStateChangeNoLock(
-      const WaitFlagsState& new_producer_state);
+      const HandleSignalsState& new_producer_state);
   void AwakeConsumerWaitersForStateChangeNoLock(
-      const WaitFlagsState& new_consumer_state);
+      const HandleSignalsState& new_consumer_state);
 
   bool has_local_producer_no_lock() const {
     lock_.AssertAcquired();