Mojo: Wrap the satisfied/unsatisfied wait flags state in a single object.

mojo/system/platform_handle_dispatcher.cc

Index: mojo/system/platform_handle_dispatcher.cc
diff --git a/mojo/system/platform_handle_dispatcher.cc b/mojo/system/platform_handle_dispatcher.cc
index e9b8af04b7a4b7b190f91d555b4e07f2c3dc8a12..294a5488d0d3e6696946827951dfbd659b6d3752 100644
--- a/mojo/system/platform_handle_dispatcher.cc
+++ b/mojo/system/platform_handle_dispatcher.cc
@@ -114,12 +114,8 @@ bool PlatformHandleDispatcher::EndSerializeAndCloseImplNoLock(
   return true;
 }
 
-MojoWaitFlags PlatformHandleDispatcher::SatisfiedFlagsNoLock() const {
-  return MOJO_WAIT_FLAG_NONE;
-}
-
-MojoWaitFlags PlatformHandleDispatcher::SatisfiableFlagsNoLock() const {
-  return MOJO_WAIT_FLAG_NONE;
+WaitFlagsState PlatformHandleDispatcher::GetWaitFlagsStateNoLock() const {
+  return WaitFlagsState();
 }
 
 }  // namespace system