Fixes keyboard transitions when pressing a space after a punctuation.
BUG=295718

Note: This is blocked on https://codereview.chromium.org/23526075/

Review URL: https://chromiumcodereview.appspot.com/24104007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224567 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224567