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This removes all the PLUGIN_PRINTF/MODULE_PRINTF calls from
components/nacl/renderer/plugin/.

There aren't very many of these logging calls left now.  They don't
look useful to have in release binaries, and it's against Chromium
style to keep this sort of logging in the code.  Anyone doing
debugging can manually add their own logging.

My main motivation here is to remove a non-standard logging mechanism
that depends on some native_client/ headers.

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=2832
TEST=e.g. NaClBrowserTestPnacl.PPAPICore (tests PNaCl translation)

Review URL: https://codereview.chromium.org/1631413002

Cr-Commit-Position: refs/heads/master@{#371865}