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 protoc must be build for the Mac platform and not for iOS. mac_build.gypi is used to allow this.

TEST=None
BUG=None
R=stuartmorgan@chromium.org


Review URL: https://chromiumcodereview.appspot.com/10855048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150778 0039d316-1c4b-4281-b951-d872f2087c98