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This reverts commit r284737.

It's no longer needed since build_pnacl_newlib plus
enable_${arch} no longer imply that the pexe should be
translated. That's controlled by the 
translate_pexe_with_build flag instead.

Also remove the adhoc uses of enable_x86_32: 0, etc.
now that pexe -> nexe is off by default.

BUG=none

Review URL: https://codereview.chromium.org/433943004

Cr-Commit-Position: refs/heads/master@{#289144}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289144 0039d316-1c4b-4281-b951-d872f2087c98