Omnibox: Make HistoryURL Highlight Titles like HistoryQuick Provider

Previously HistoryURL provider would highlight page titles by
searching for the first occurrence of the input term and highlighting
it.  This was case sensitive.

Now HistoryURL provider highlights page titles in the same way as
HistoryQuick provider: it normalizes the title (i.e., lowercases it)
and highlights all occurrences that appear at word breaks.

TBR=sky

BUG=318329

Review URL: https://codereview.chromium.org/77453007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237504 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237504