Revert "Quick fix for deprecated async syntax"

This reverts commit afc1e24571.

idea/testData/quickfix/asyncUnsupported/asyncInfixCall.kt

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-infix fun Any.async(f: () -> Unit) = f()
-
-fun test(foo: Any) {
-    foo <caret>async { }
-}

idea/testData/quickfix/asyncUnsupported/asyncInfixCall.kt.after

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-infix fun Any.async(f: () -> Unit) = f()
-
-fun test(foo: Any) {
-    foo <caret>async ({ })
-}

idea/testData/quickfix/asyncUnsupported/asyncInfixCallWithFun.kt

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-infix fun Any.async(f: () -> Unit) = f()
-
-fun test(foo: Any) {
-    foo async<caret> fun () {}
-}

idea/testData/quickfix/asyncUnsupported/asyncInfixCallWithFun.kt.after

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-infix fun Any.async(f: () -> Unit) = f()
-
-fun test(foo: Any) {
-    foo async<caret> (fun () {})
-}

idea/testData/quickfix/asyncUnsupported/asyncWithLambda.kt

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-fun async(f: () -> Unit) {}
-
-fun test() {
-    asy<caret>nc {  }
-}

idea/testData/quickfix/asyncUnsupported/asyncWithLambda.kt.after

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-fun async(f: () -> Unit) {}
-
-fun test() {
-    asy<caret>nc() {  }
-}

idea/testData/quickfix/asyncUnsupported/asyncWithLambdaAndComment.kt

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-fun async(f: () -> Unit) {}
-
-fun test() {
-    async<caret> /**/ {  }
-}

idea/testData/quickfix/asyncUnsupported/asyncWithLambdaAndComment.kt.after

@@ -1,6 +0,0 @@
-// "Migrate unsupported async syntax" "true"
-fun async(f: () -> Unit) {}
-
-fun test() {
-    async<caret>() /**/ {  }
-}