Removing unused private field from Windows NSSDecryptor

Coding standard and compiler do not like unused private fields, but
sometimes they slip between the cracks until they trigger something:

In file included from gen/chrome/utility/utility_jumbo_1.cc:12:
In file included from .\../../chrome/utility/importer/firefox_importer.cc:26:
In file included from ../..\chrome/utility/importer/nss_decryptor.h:13:
../..\chrome/utility/importer/nss_decryptor_win.h(169,29):  error: private field 'PK11_CheckUserPassword' is not used [-Werror,-Wunused-private-field]
  PK11CheckUserPasswordFunc PK11_CheckUserPassword;
                            ^
1 error generated.

This removes the unsued field. Also removing an "explicit" to get past
presubmit checks.

Running presubmit upload checks ...

L: \src\clean_chromium\src\chrome\utility\importer\nss_decryptor_win.cc:18:  Zero-parameter constructors should not be marked explicit.  [runtime/explicit] [5]
Change-Id: Id310c0f65a406c1a47ec29312472580d15dfd1ce
Reviewed-on: https://chromium-review.googlesource.com/c/1259018
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596375}
2 files changed