Drop 'propertyDelegated' convention (without additional deprecation ceremony).

idea/testData/findUsages/kotlin/conventions/propertyDelegatedFunction.0.kt

@@ -1,16 +0,0 @@
-// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtNamedFunction
-// OPTIONS: usages
-
-import kotlin.reflect.KProperty
-
-class Delegate() {
-    operator fun getValue(thisRef: Any?, property: KProperty<*>): String = ":)"
-
-    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
-    }
-
-    operator fun <caret>propertyDelegated(property: KProperty<*>) {
-    }
-}
-
-var p: String by Delegate()

idea/testData/findUsages/kotlin/conventions/propertyDelegatedFunction.log

@@ -1,4 +0,0 @@
-Resolved by Delegate()
-Searched references to Delegate
-Used plain search of Delegate.propertyDelegated(property: KProperty<*>) in LocalSearchScope:
-    CLASS:Delegate

idea/testData/findUsages/kotlin/conventions/propertyDelegatedFunction.results.txt

@@ -1 +0,0 @@
-Property delegation 16 var p: String by Delegate()