'shouldLabelFloat' Error during ng update @angular/material

[tomgruszowski]

Reproduction

Get a 'Found class "InputFileComponent" which extends "MatFormFieldControl". This class must define "shouldLabelFloat" which is now a required property' error during ng update to angular material 8

My class correctly implements this property per angular docs. https://material.angular.io/guide/creating-a-custom-form-field-control#-code-shouldlabelfloat-code-

@HostBinding('class.floating')
get shouldLabelFloat() {
return this.focused || !this.empty;
}

Expected Behavior

There shouldn't be an error

Actual Behavior

Error

Environment

• Angular: 8.0.0
• CDK/Material: 8.0.0
• Browser(s): Chrome latest
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10 1809

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