shill: cleaning glint warnings

The typical warnings addressed include a lot of missing includes
and missing argument names. About 30 files edited in total.

Cpplint was the actual lint being run.

BUG=chromium-os:15873
TEST=Ran all the unit tests.

Change-Id: I64a8b76cd8f94c7729743b76b41a956f1b7370cf
Reviewed-on: https://gerrit.chromium.org/gerrit/12253
Commit-Ready: Hristo Stefanov <hstefanov@chromium.org>
Reviewed-by: Hristo Stefanov <hstefanov@chromium.org>
Tested-by: Hristo Stefanov <hstefanov@chromium.org>
diff --git a/modem_manager.h b/modem_manager.h
index 1c926cb..be404f9 100644
--- a/modem_manager.h
+++ b/modem_manager.h
@@ -6,6 +6,7 @@
 #define SHILL_MODEM_MANAGER_
 
 #include <map>
+#include <string>
 #include <tr1/memory>
 
 #include <base/basictypes.h>