Fix linter error.

crisbeto · crisbeto · commit d88365dd1058 · 2017-01-19T21:10:50.000+01:00
diff --git a/src/lib/core/selection/pseudo-checkbox/pseudo-checkbox.scss b/src/lib/core/selection/pseudo-checkbox/pseudo-checkbox.scss
@@ -24,7 +24,7 @@ md-pseudo-checkbox {
   &::after {
     position: absolute;
     opacity: 0;
-    content: "";
+    content: '';
     border-bottom: $md-checkbox-border-width solid currentColor;
     transition: opacity $md-checkbox-transition-duration $md-linear-out-slow-in-timing-function;
   }

Original file line number	Diff line number	Diff line change
`@@ -24,7 +24,7 @@ md-pseudo-checkbox {`
`24`	`24`	`&::after {`
`25`	`25`	`position: absolute;`
`26`	`26`	`opacity: 0;`
`27`		`- content: "";`
	`27`	`+ content: '';`
`28`	`28`	`border-bottom: $md-checkbox-border-width solid currentColor;`
`29`	`29`	`transition: opacity $md-checkbox-transition-duration $md-linear-out-slow-in-timing-function;`
`30`	`30`	`}`