debugd: Fix coding style and cpplint issues.

BUG=chromium:385849
TEST=`FEATURES=test emerge-$BOARD platform2`
TEST=`cpplint.py --root=src --filter=-build/include src/{*.h,*.cc,*/*.cc}`

Change-Id: Ia2475d6ee287dc727c3b2ffe139e9cc8bfe2e2e5
Reviewed-on: https://chromium-review.googlesource.com/204391
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/debugd/src/netif_tool.h b/debugd/src/netif_tool.h
index f0b7493..8b91cf9 100644
--- a/debugd/src/netif_tool.h
+++ b/debugd/src/netif_tool.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NETIF_TOOL_H
-#define NETIF_TOOL_H
+#ifndef NETIF_TOOL_H_
+#define NETIF_TOOL_H_
 
 #include <string>
 
@@ -18,10 +18,11 @@
   ~NetifTool();
 
   std::string GetInterfaces(DBus::Error* error);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(NetifTool);
 };
 
-};  // namespace debugd
+}  // namespace debugd
 
-#endif  // NETIF_TOOL_H
+#endif  // NETIF_TOOL_H_