Adjust various testData to size transformation

compiler/testData/codegen/box/extensionFunctions/kt475.kt

@@ -10,9 +10,9 @@ fun box() : String {
 }
 
 var <T> ArrayList<T>.length : Int
-    get() = size()
+    get() = size
     set(value: Int) = throw java.lang.Error()
 
 var <T> ArrayList<T>.last : T
-    get() = get(size()-1)!!
-    set(el : T) { set(size()-1, el) }
+    get() = get(size-1)!!
+    set(el : T) { set(size-1, el) }

compiler/testData/codegen/box/extensionFunctions/kt865.kt

@@ -15,5 +15,5 @@ class Template() {
 fun box() : String {
     val u = Template()
     u.test()
-    return if(u.collected.size() == 1 && u.collected.get(0) == "239") "OK" else "fail"
+    return if(u.collected.size == 1 && u.collected.get(0) == "239") "OK" else "fail"
 }