Fix JDK-dependent stdlib tests after advancing jvmTarget

libraries/stdlib/js/test/core/testUtils.kt

@@ -11,13 +11,6 @@ public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
     assertEquals(expected?.let { it::class.js }, actual?.let { it::class.js })
 }
 
-@Suppress("NOTHING_TO_INLINE")
-internal actual inline fun String.removeLeadingPlusOnJava6(): String = this
-
-internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
-    f()
-}
-
 
 public actual fun testOnJvm(action: () -> Unit) { }
 public actual fun testOnJs(action: () -> Unit) = action()
@@ -25,8 +18,6 @@ public actual fun testOnJs(action: () -> Unit) = action()
 // TODO: should be true at least in JS IR after implementing KT-24975
 public actual val isFloat32RangeEnforced: Boolean = false
 
-actual val supportsSuppressedExceptions: Boolean get() = true
-
 public actual val supportsNamedCapturingGroup: Boolean get() = true
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = false