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/dhcp_config_unittest.cc b/dhcp_config_unittest.cc
index a8b4512..47e1f5c 100644
--- a/dhcp_config_unittest.cc
+++ b/dhcp_config_unittest.cc
@@ -12,12 +12,12 @@
 
 #include "shill/dbus_adaptor.h"
 #include "shill/dhcp_provider.h"
+#include "shill/event_dispatcher.h"
 #include "shill/mock_control.h"
 #include "shill/mock_dhcp_proxy.h"
 #include "shill/mock_glib.h"
 #include "shill/property_store_unittest.h"
 #include "shill/proxy_factory.h"
-#include "shill/shill_event.h"
 
 using std::string;
 using std::vector;