chips: with disabled, input styles are inconsistent

[NoMaillard]

Actual Behavior:

• What is the issue? * when you have an input in a md-chips, you can disable it, but the styles are inconsistent with other input type (normal input, select)
• What is the expected behavior? it should be consistent

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: http://codepen.io/NoMaillard/pen/dOBPpy
• Details:

Angular Versions: *

• Angular Version: 1.5.5
• Angular Material Version: 1.1.1

Additional Information:

• Browser Type: *
• Browser Version: *
• OS: *
• Stack Traces: