shill: A couple of naming cleanups

Rename shill_event.* -> event_dispatcher.*.  This is more
consistent with correct style.  Also rename IOInputHandler ->
InputHandler.

BUG=None
TEST=Rerun unit tests

Change-Id: I13d56b857c85b32ba1418e894de68afc5a23f00d
Reviewed-on: http://gerrit.chromium.org/gerrit/10326
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/wifi_endpoint.h b/wifi_endpoint.h
index c7b161c..0093425 100644
--- a/wifi_endpoint.h
+++ b/wifi_endpoint.h
@@ -15,7 +15,7 @@
 #include <gtest/gtest_prod.h>  // for FRIEND_TEST
 
 #include "shill/endpoint.h"
-#include "shill/shill_event.h"
+#include "shill/event_dispatcher.h"
 
 namespace shill {