Remove NaCl weak_ref deps from irt_manifest_file test.
Remove NaCl weak_ref deps from irt_manifest_file test.

The old pm_manifest tests relied on weak_ref, but this does not
(pm_manifest tests deleted here https://codereview.chromium.org/535223002/diff/60001/chrome/test/data/nacl/manifest_file/pm_manifest_file_test.cc)

Remove deps so that we can delete the weak_ref library.
E.g.,: https://codereview.chromium.org/1317853002/

BUG=none

Review URL: https://codereview.chromium.org/1309313003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#345646}

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