Polish the removal of EventHandler cleanup in r26517.

runtime/bin/eventhandler_android.cc

Index: runtime/bin/eventhandler_android.cc
diff --git a/runtime/bin/eventhandler_android.cc b/runtime/bin/eventhandler_android.cc
index 975a6d1f5290739888a0a41e3a96c11d95dfd51e..9064be199539e4a8e5c5ed182e9f2ce9e13fc053 100644
--- a/runtime/bin/eventhandler_android.cc
+++ b/runtime/bin/eventhandler_android.cc
@@ -163,6 +163,7 @@ void EventHandlerImplementation::WakeupHandler(intptr_t id,
   // WriteToBlocking will write up to 512 bytes atomically, and since our msg
   // is smaller than 512, we don't need a thread lock.
   // See: http://linux.die.net/man/7/pipe, section 'Pipe_buf'.
+  ASSERT(kInterruptMessageSize < PIPE_BUF);
   intptr_t result =
       FDUtils::WriteToBlocking(interrupt_fds_[1], &msg, kInterruptMessageSize);
   if (result != kInterruptMessageSize) {