Separate out chrome common files in the gypi

This will make it possible to share the file list with the GN build.

BUG=
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Review URL: https://codereview.chromium.org/331083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277490 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed