[Gradle, JS] Remove redundant delegation

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinBrowserJs.kt

@@ -60,29 +60,20 @@ open class KotlinBrowserJs @Inject constructor(target: KotlinJsTarget) :
 
     override fun runTask(body: KotlinWebpack.() -> Unit) {
         commonRunConfigurations.add(body)
-        irBrowser?.runTask(body)
     }
 
     @ExperimentalDistributionDsl
     override fun distribution(body: Distribution.() -> Unit) {
         distribution.body()
-        target.irTarget?.browser?.distribution(body)
     }
 
     override fun webpackTask(body: KotlinWebpack.() -> Unit) {
         commonWebpackConfigurations.add(body)
-        irBrowser?.webpackTask(body)
     }
 
     @ExperimentalDceDsl
     override fun dceTask(body: KotlinJsDce.() -> Unit) {
         dceConfigurations.add(body)
-        irBrowser?.dceTask(body)
-    }
-
-    override fun testTask(body: KotlinJsTest.() -> Unit) {
-        super<KotlinJsSubTarget>.testTask(body)
-        irBrowser?.testTask(body)
     }
 
     override fun configureMain(compilation: KotlinJsCompilation) {

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinNodeJs.kt

@@ -31,12 +31,10 @@ open class KotlinNodeJs @Inject constructor(target: KotlinJsTarget) :
 
     override fun runTask(body: NodeJsExec.() -> Unit) {
         (project.tasks.getByName(runTaskName) as NodeJsExec).body()
-        irNodejs?.runTask(body)
     }
 
     override fun testTask(body: KotlinJsTest.() -> Unit) {
         super<KotlinJsSubTarget>.testTask(body)
-        irNodejs?.testTask(body)
     }
 
     override fun configureDefaultTestFramework(testTask: KotlinJsTest) {