Don't test parsing boolean values in css

CSS doesn't have any boolean properties.

testsuite/css/parser/Makefile.am

@@ -179,9 +179,6 @@ test_data = \
 	background-shorthand-single.ref.css \
         background-size.css \
         background-size.ref.css \
-	boolean.css \
-	boolean.errors \
-	boolean.ref.css \
 	border.css \
 	border.errors \
 	border.ref.css \

testsuite/css/parser/boolean.css

@@ -1,48 +0,0 @@
-a {
-  boolean-property: true;
-}
-b {
-  boolean-property: TRUE;
-}
-c {
-  boolean-property: tRuE;
-}
-d {
-  boolean-property: 1;
-}
-e {
-  boolean-property: false;
-}
-f {
-  boolean-property: FALSE;
-}
-g {
-  boolean-property: FAlsE;
-}
-h {
-  boolean-property: 0;
-}
-i {
-  boolean-property: trueest;
-}
-j {
-  boolean-property: T;
-}
-k {
-  boolean-property: tru;
-}
-l {
-  boolean-property: 0.0;
-}
-m {
-  boolean-property: 1.0;
-}
-n {
-  boolean-property: fals;
-}
-o {
-  boolean-property: f;
-}
-p {
-  boolean-property: FAL;
-}

testsuite/css/parser/boolean.errors

@@ -1,8 +0,0 @@
-boolean.css:26: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:29: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:32: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:35: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:38: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:41: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:44: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
-boolean.css:47: error: GTK_CSS_PROVIDER_ERROR_SYNTAX

testsuite/css/parser/boolean.ref.css

@@ -1,31 +0,0 @@
-a {
-  boolean-property: true;
-}
-
-b {
-  boolean-property: true;
-}
-
-c {
-  boolean-property: true;
-}
-
-d {
-  boolean-property: true;
-}
-
-e {
-  boolean-property: false;
-}
-
-f {
-  boolean-property: false;
-}
-
-g {
-  boolean-property: false;
-}
-
-h {
-  boolean-property: false;
-}