shill: Update to build against libchrome-242728.

BUG=chromium:341521
CQ-DEPEND=CL:193660
TEST=Tested the following:
1. `FEATURES=test USE='cellular wimax' emerge-$BOARD platform2`
2. Run the following tests:
   - network_3GSmokeTest
   - network_VPNConnect.*
   - network_WiMaxSmoke
   - wifi_matfunc

Change-Id: Ic1553c182ab7a833a68c45f012f646b8930cb095
Reviewed-on: https://chromium-review.googlesource.com/193606
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/cellular_capability_gsm_unittest.cc b/cellular_capability_gsm_unittest.cc
index 18a5012..e7c0450 100644
--- a/cellular_capability_gsm_unittest.cc
+++ b/cellular_capability_gsm_unittest.cc
@@ -8,7 +8,7 @@
 #include <vector>
 
 #include <base/bind.h>
-#include <base/stringprintf.h>
+#include <base/strings/stringprintf.h>
 #include <chromeos/dbus/service_constants.h>
 #include <mm/mm-modem.h>
 #include <mobile_provider.h>