floss: use delete ctor and remove all base/macros.h includes

The deprecated macros will be removed from base/macros.h from libchrome
r938828. The header file will no longer contains any macros and hence
renamed to base/ignore_result.h in libchrome r941411.

Bug: 211560276
Tag: #floss
Test: FEATURES=test emerge-hatch floss
Change-Id: I83c8c0d0a668df0d62544894884fe30d80f9f821