Cancel mid-word spelling requests

Spelling markers disappear for all text while typing in the middle of a word,
because the cached results are empty. This patch cancels such spelling requests,
which preserves the spelling markers.

BUG=223708


Review URL: https://chromiumcodereview.appspot.com/12869016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@190597 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed