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/io_handler.h b/io_handler.h
index ed0f5d7..74c34b9 100644
--- a/io_handler.h
+++ b/io_handler.h
@@ -15,10 +15,10 @@
   size_t len;
 };
 
-class IOInputHandler {
+class IOHandler {
  public:
-  IOInputHandler() {}
-  virtual ~IOInputHandler() {}
+  IOHandler() {}
+  virtual ~IOHandler() {}
 };
 
 }  // namespace shill