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/cellular.cc b/cellular.cc
index ff13300..a6a3c61 100644
--- a/cellular.cc
+++ b/cellular.cc
@@ -22,13 +22,13 @@
 #include "shill/device.h"
 #include "shill/device_info.h"
 #include "shill/error.h"
+#include "shill/event_dispatcher.h"
 #include "shill/manager.h"
 #include "shill/modem_simple_proxy_interface.h"
 #include "shill/profile.h"
 #include "shill/property_accessor.h"
 #include "shill/proxy_factory.h"
 #include "shill/rtnl_handler.h"
-#include "shill/shill_event.h"
 
 using std::make_pair;
 using std::map;