Allow dialogs to use a custom View as their title.

Added a method to DialogDelegate that lets a dialog subclass specify a
View that will be used as the dialog's title. As an example, changed the
Save Password dialog and removed its ad-hoc title. Also removed
SetTitleFontList, as it's not clear how it should interact with a generic
View title, and updated the subclasses that were using it.

BUG=654115,702196

Review-Url: https://codereview.chromium.org/2907983002
Cr-Commit-Position: refs/heads/master@{#482840}
11 files changed