[DevTools] Empty attribute name/value pair added in Elements panel should be removed 
[DevTools] Empty attribute name/value pair added in Elements panel should be removed 

If the edited attribute name and the value are empty it should be removed from the list item 
representing the element.

Patch by vivekgalatage@gmail.com

BUG=231187
R=apavlov

Review URL: https://codereview.chromium.org/14107009/


git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148439 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs