mdIcon: malformed HTML in tests

[alopezsanchez]

Actual Behavior:

• What is the issue? *
  There are some malformed HTML in mdIcon tests.

• What is the expected behavior?

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue:
• Details:
  https://github.com/angular/material/blob/master/src/components/icon/icon.spec.js#L468
  https://github.com/angular/material/blob/master/src/components/icon/icon.spec.js#L460

AngularJS Versions: *

• AngularJS Version: Not applicable
• AngularJS Material Version: Not applicable

Additional Information:

• Browser Type: * Not applicable
• Browser Version: * Not applicable
• OS: * Not applicable
• Stack Traces:

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