Refactor views::Label and gfx::RenderText shadow functions.

This is mechanical cleanup in preparation for a Label rewrite.
Use simple gfx::ShadowValues setter functions everywhere.
Remove a forbidden static FontList instance.

BUG=240037
TEST=No appearance changes for views text shadows.
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Review URL: https://codereview.chromium.org/343513002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278101 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed