buffet: Cleaned up the remaining linter warnings

Fixed the remaining warnings from cpplint. So now every file
in platform2/buffet conforms to the default linter settings.

BUG=None
TEST=Code still compiles and unit tests pass

Change-Id: I094d06789590c6c76679c1e1c758525898e86923
Reviewed-on: https://chromium-review.googlesource.com/199414
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/buffet/exported_object_manager.h b/buffet/exported_object_manager.h
index 14a0b1a..e1d8884 100644
--- a/buffet/exported_object_manager.h
+++ b/buffet/exported_object_manager.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 EXPORTED_OBJECT_MANAGER_H_
-#define EXPORTED_OBJECT_MANAGER_H_
+#ifndef BUFFET_EXPORTED_OBJECT_MANAGER_H_
+#define BUFFET_EXPORTED_OBJECT_MANAGER_H_
 
 #include <map>
 #include <string>
@@ -115,4 +115,4 @@
 
 }  //  namespace buffet
 
-#endif  // EXPORTED_OBJECT_MANAGER_H_
+#endif  // BUFFET_EXPORTED_OBJECT_MANAGER_H_