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This patch adds new scrollbars and restyles the preview images to match the recent specs.

TEST=Run chrome with --file-manager-new-ui, launch Files.app and verify.
BUG=226912


Review URL: https://chromiumcodereview.appspot.com/13783003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193010 0039d316-1c4b-4281-b951-d872f2087c98