shill: Create an asynchronous resolver object

Resolve DNS requests using the c-ares library but
using the shill event loop to handle events.

BUG=chromium-os:21664
TEST=New unit test

Change-Id: I99776b6cc74977d31198c67357c42a75f4047942
Reviewed-on: https://gerrit.chromium.org/gerrit/10328
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/glib_io_ready_handler.h b/glib_io_ready_handler.h
index 919c8c3..3a3d310 100644
--- a/glib_io_ready_handler.h
+++ b/glib_io_ready_handler.h
@@ -20,9 +20,9 @@
 // sockets and effort to working with peripheral libraries.
 class GlibIOReadyHandler : public IOHandler {
  public:
-    GlibIOReadyHandler(int fd,
-                       IOHandler::ReadyMode mode,
-                       Callback1<int>::Type *callback);
+  GlibIOReadyHandler(int fd,
+                     IOHandler::ReadyMode mode,
+                     Callback1<int>::Type *callback);
   ~GlibIOReadyHandler();
 
   virtual void Start();