md-toolbar reduces height 1px early

[wyers]

Bug, feature request, or proposal:

I would like for the md-toolbar media query to fire on max-width: 599 instead of 600.
Light digging suggests this is being defined here: https://github.com/angular/material2/blob/master/src/lib/core/style/_variables.scss

What is the expected behavior?

'xs' should be < 600

What is the current behavior?

'xs' is <= 600

What are the steps to reproduce?

the provided plunkr template is sufficient, just reduce view area to 601px.
then reduce to 600px.

https://goo.gl/DlHd6U

What is the use-case or motivation for changing an existing behavior?

alignment with flex-layout: https://github.com/angular/flex-layout/wiki/Responsive-API
and material spec: https://material.io/guidelines/layout/responsive-ui.html#responsive-ui-breakpoints (suppose this one depends on which way you read it, but i consider the breakpoint non-inclusive.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

latest

Is there anything else we should know?

n/a

[willshowell]

Related #5960 and #6772 (comment)

[josephperrott]

Closing as this is being handled in #6772

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