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Adds initial support to views::Link as well, by allowing it to pass
TextContext to its parent views::Label constructor.

The entire StyledLabel has a single TextContext. A default TextStyle
can be optionally overridden on a RangeStyleInfo.

Audited the StyledLabel consumers: One consumer (EchoDialogView)
uses underlined text outside of a Link. The dialog is under review
(http://crbug.com/768663), so don't add a style for it.

The PageInfoBubble was the only consumer that wanted an underline on
its links. Remove underlines from all links in the page info bubble for
consistency with the rest of Chrome's UI.

All the (slow) FontList::Derive(..) calls disappear from StyledLabel.
Most fonts just come from the ResourceBundle cache now, unless they
need a custom_font (which is currently just EchoDialogView).

Bug: 691891
Change-Id: I6cca4480d366d2578ac01da4d604a414415ffbc4
Reviewed-on: https://chromium-review.googlesource.com/649930
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505246}