history: use display title, not page title

entry.title() is the underlying page title, but we want to record
in history the actual title we show to the user.  These differ in
corner cases like when the page lacks a title, and also importantly
in that the display title can include RTL metadata.

BUG=27094

Review URL: http://codereview.chromium.org/7453053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95008 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed