Material Icons are not centered vertically to parent

#### Reproduction

https://stackblitz.com/edit/angular-tzta8m

You will see that mat-icon is not centered vertically in button element.

#### Expected Behavior

Should be centered vertically, too.

#### Actual Behavior

Not centered, not so fancy.

#### Environment

- Angular, CDK/Material from Stackblitz:

```
"@angular/animations": "^8.2.9",
"@angular/cdk": "~8.2.2",
"@angular/common": "^8.2.9",
"@angular/compiler": "^8.2.9",
"@angular/core": "^8.2.9",
"@angular/forms": "^8.2.9",
"@angular/material": "~8.2.2",
"@angular/material-moment-adapter": "~8.2.2",
"@angular/platform-browser": "^8.2.9",
"@angular/platform-browser-dynamic": "^8.2.9",
"@angular/router": "^8.2.9",
"hammerjs": "^2.0.8",
"@angular-devkit/build-angular": "^0.803.8",
"@angular/cli": "^8.3.8",
"@angular/compiler-cli": "^8.2.9",
"@angular/language-service": "^8.2.9",
```

- Browser(s): Chrome Version 79.0.3945.130 (Official Build) (64-bit)
- Operating System (e.g. Windows, macOS, Ubuntu): Windows 10 Enterprise 1903

Commencez par la reproduction StackBlitz liée et examinez le comportement de Angular Material button et mat-icon qui y est présenté. Confirmez le problème d’alignement vertical dans les versions indiquées d’Angular et de Material ; le travail est considéré comme terminé lorsque l’icône est centrée verticalement dans son bouton sans casser la reproduction.

Rédigé par le modèle d'indexation à partir du texte de l'issue.