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/dhcp_provider.cc b/dhcp_provider.cc
index 7a9cf96..f92d585 100644
--- a/dhcp_provider.cc
+++ b/dhcp_provider.cc
@@ -5,7 +5,7 @@
 #include "shill/dhcp_provider.h"
 
 #include <base/file_util.h>
-#include <base/stringprintf.h>
+#include <base/strings/stringprintf.h>
 
 #include "shill/control_interface.h"
 #include "shill/dhcp_config.h"
@@ -90,7 +90,7 @@
 
 void DHCPProvider::DestroyLease(const string &name) {
   SLOG(DHCP, 2) << __func__ << " name: " << name;
-  file_util::Delete(root_.Append(
+  base::DeleteFile(root_.Append(
       base::StringPrintf(kDHCPCDPathFormatLease,
                          name.c_str())), false);
 }