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Also add an explicit check for whitelisting pepper/nacl
permissions based on importing a shared module, so a shared
module can potentially limit allowing import of its resources
and permissions its allowed.

You can still use nonsfi mode for Linux or ChromeOS by
passing in --enable-nacl-nonsfi-mode, but it is on for a
whitelisted set of extensions for ChromeOS without flags.

BUG=355141
TEST=deploy_chrome to daisy, test app which includes whitelisted module

Review URL: https://codereview.chromium.org/264923011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269626 0039d316-1c4b-4281-b951-d872f2087c98