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.cc b/dhcp_config.cc
index 0ba8485..8b4732b 100644
--- a/dhcp_config.cc
+++ b/dhcp_config.cc
@@ -13,10 +13,10 @@
 
 #include "shill/dhcpcd_proxy.h"
 #include "shill/dhcp_provider.h"
+#include "shill/event_dispatcher.h"
 #include "shill/glib.h"
 #include "shill/ip_address.h"
 #include "shill/proxy_factory.h"
-#include "shill/shill_event.h"
 
 using std::string;
 using std::vector;