Add and use a base::i18n::StringWithDirection for carrying titles.

This is a refactoring of r82400.  We're going to need the title
direction in a bunch of different places; it's better to package
it up as one object.

BUG=27094

Review URL: http://codereview.chromium.org/6878089

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82582 0039d316-1c4b-4281-b951-d872f2087c98
13 files changed