fix lint

Author: gioragutt

src/material/chips/chip-input.ts

@@ -9,7 +9,8 @@
 import {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';
 import {BACKSPACE, hasModifierKey, TAB} from '@angular/cdk/keycodes';
 import {
-  AfterContentInit, Directive,
+  AfterContentInit, 
+  Directive,
   ElementRef,
   EventEmitter,
   Inject,