Replaced all single strings with localized resources.

BUG=270362
NOTRY=true

Review URL: https://codereview.chromium.org/185853005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255080 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255080