GitLab

Calling pushState when the search page is shown causes history entries after
the current one to be lost.

This mimics the pre-r271538 behavior where it set location.hash. Setting
location.hash is a no-op (rather than pushing a duplicate history entry) if the
hash has not changed.

BUG=401004

Review URL: https://codereview.chromium.org/446093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287892 0039d316-1c4b-4281-b951-d872f2087c98