Force embeddedbitmaps off for test_shell.
Force embeddedbitmaps off for test_shell.

The embeddedbitmaps flag controls if we'll use bitmap strikes in
vector fonts or not. Previously this was unspecified so was distro
dependent.

This fixes WebKit layout test issues with WebKit's r60477.

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@48643 0039d316-1c4b-4281-b951-d872f2087c98

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