chips: remove icon is larger in 1.1.0 vs 1.0.9

[ddimitrop]

Actual Behavior:

• What is the issue? *
  The remove icons for md-chips are 24px in the 1.1 version. They used to be 18px.
  The change was not intentional but due to the min-width, min-height properties that have now been added in md-icon.
  All references to md-icon in the code (where they override width and height) need to be fixed.
• What is the expected behavior?
  The remove icons should be 18px. This is what this code is trying to do:
  https://github.com/angular/material/blob/master/src/components/chips/chips.scss#L130
  This needs to include now:
  min-height: $chip-delete-icon-size;
  min-width: $chip-delete-icon-size;

I believe that the same problem may be happening in other places like here:

material/src/components/list/list.scss

Line 62 in dfc9ae7

width: $list-item-dense-primary-icon-width;

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue:
  https://material.angularjs.org/latest/demo/chips
• Details:
  Inspect the 'X' icons

Angular Versions: *

• Angular Version: 1.5.5
• `Angular Material Version: 1.1.1

Additional Information:

• Browser Type: Chrome
• `Browser Version: 53
• `OS: Linux
• Stack Traces:

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[batsauto]

here is my pull request to fix this issue.
#10491