Revert "[NI] Add checking @NotNull parameters for candidates"

This reverts commit 910177ab17.

core/descriptors/src/org/jetbrains/kotlin/types/TypeCapabilities.kt

@@ -27,10 +27,6 @@ interface CustomTypeVariable {
     fun substitutionResult(replacement: KotlinType): KotlinType
 }
 
-// That interface is needed to provide information about definitely not null
-//   type parameters (e.g. from @NotNull annotation) to type system
-interface NotNullTypeVariable : CustomTypeVariable
-
 fun KotlinType.isCustomTypeVariable(): Boolean = (unwrap() as? CustomTypeVariable)?.isTypeVariable ?: false
 fun KotlinType.getCustomTypeVariable(): CustomTypeVariable? =
         (unwrap() as? CustomTypeVariable)?.let {

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -333,10 +333,6 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext {
         return builtIns.nothingType
     }
 
-    override fun anyType(): SimpleTypeMarker {
-        return builtIns.anyType
-    }
-
     val builtIns: KotlinBuiltIns get() = throw UnsupportedOperationException("Not supported")
 
     override fun KotlinTypeMarker.makeDefinitelyNotNullOrNotNull(): KotlinTypeMarker {