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/mock_dhcp_proxy.h b/mock_dhcp_proxy.h
index a45abe3..f982b91 100644
--- a/mock_dhcp_proxy.h
+++ b/mock_dhcp_proxy.h
@@ -5,6 +5,8 @@
 #ifndef SHILL_MOCK_DHCP_PROXY_H_
 #define SHILL_MOCK_DHCP_PROXY_H_
 
+#include <string>
+
 #include <base/basictypes.h>
 #include <gmock/gmock.h>