Fix web integration tests

web/benchmark-core/src/jsMain/kotlin/com/sample/style/Stylesheet.kt

@@ -3,7 +3,7 @@ package com.sample.style
 import org.jetbrains.compose.web.css.*
 import org.jetbrains.compose.web.css.selectors.CSSSelector
 
-object AppCSSVariables : CSSVariables {
+object AppCSSVariables {
     val wtColorGreyLight by variable<CSSColorValue>()
     val wtColorGreyDark by variable<CSSColorValue>()
 

web/integration-core/src/jsMain/kotlin/androidx/compose/web/sample/Sample.kt

@@ -38,7 +38,7 @@ class State {
 val globalState = State()
 val globalInt = mutableStateOf(1)
 
-object MyCSSVariables : CSSVariables {
+object MyCSSVariables {
     val myVar by variable<CSSColorValue>()
     val myVar2 by variable<StylePropertyString>()
 }