[Blink] Removing link applies underline to collapsed caret

[Marek Lewandowski]

1. open any sample with CKEditor (i.e. samples/replacebyclass.html)
2. using Source button set following source:

   <p><a href="http://foo">foo</a>bar</p>
   

3. return to wysiwyg mode
4. create following selection [foo]bar
5. press backspace
6. input any text

Expected result:
Inputted text should not be underlined.

Current result:
New text is being underlined.

additional info:

1. Checked with Opera (blink) 19.0.1326.63, Chrome 32.0.1700.107 @ Win8

[Marek Lewandowski]

Duplicate of #9998