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_property_set.h b/buffet/exported_property_set.h
index 8e535b6..3d7abc5 100644
--- a/buffet/exported_property_set.h
+++ b/buffet/exported_property_set.h
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <string>
+#include <vector>
 
 #include <base/memory/weak_ptr.h>
 #include <dbus/exported_object.h>
@@ -168,7 +169,7 @@
 
  private:
   OnUpdateCallback on_update_;
-  T value_{};
+  T value_{};  // NOLINT - initializer list
 
   DISALLOW_COPY_AND_ASSIGN(ExportedProperty);
 };