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/routing_table_unittest.cc b/routing_table_unittest.cc
index 497e660..0ba1f5b 100644
--- a/routing_table_unittest.cc
+++ b/routing_table_unittest.cc
@@ -26,7 +26,7 @@
 
 class TestEventDispatcher : public EventDispatcher {
  public:
-  virtual IOInputHandler *CreateInputHandler(
+  virtual IOHandler *CreateInputHandler(
       int /*fd*/,
       Callback1<InputData*>::Type */*callback*/) {
     return NULL;