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Do this by using textfield colors instead of label default colors. The change to
pre-MD and non-OTR should be extremely minimal (text that's \#222 becomes
\#000). The same colors are used regardless of the drag source (bookmark bar or
location bar), and this just matches the location bar instead of the bookmark
bar. Either way it's hard to notice a difference anywhere except MD OTR mode.

Also support systems without translucency better. We don't need a text shadow
but we do need a background (and border) on these systems.

BUG=581239

Review URL: https://codereview.chromium.org/1633793003

Cr-Commit-Position: refs/heads/master@{#371544}