AppViewManager is renamed into ViewUtils since angular2 beta 16

[Maks3w]

Angular 2 Beta 16 CHANGELOG

AppViewManager is renamed into ViewUtils and is a mere private utility service.

https://github.com/angular/material2/search?utf8=%E2%9C%93&q=AppViewManager

[jelbourn]

Removed references to AppViewManager in #378

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