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Added a default in common.gypi to remove headers from all mac applications that are bundles.
Added a var to control the inclusion of keystone to chrome.gyp defaulted on branding and then honor it for the shipping work.
Review URL: http://codereview.chromium.org/113652

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16510 0039d316-1c4b-4281-b951-d872f2087c98