Make DisposableHandle fun interface, remove our own adapter (#2790)

Author: qwwdfsad

kotlinx-coroutines-core/api/kotlinx-coroutines-core.api

@@ -367,7 +367,6 @@ public final class kotlinx/coroutines/Job$Key : kotlin/coroutines/CoroutineConte
 }
 
 public final class kotlinx/coroutines/JobKt {
-	public static final fun DisposableHandle (Lkotlin/jvm/functions/Function0;)Lkotlinx/coroutines/DisposableHandle;
 	public static final fun Job (Lkotlinx/coroutines/Job;)Lkotlinx/coroutines/CompletableJob;
 	public static final synthetic fun Job (Lkotlinx/coroutines/Job;)Lkotlinx/coroutines/Job;
 	public static synthetic fun Job$default (Lkotlinx/coroutines/Job;ILjava/lang/Object;)Lkotlinx/coroutines/CompletableJob;

kotlinx-coroutines-core/common/src/Job.kt

@@ -387,26 +387,14 @@ public fun Job0(parent: Job? = null): Job = Job(parent)
 /**
  * A handle to an allocated object that can be disposed to make it eligible for garbage collection.
  */
-public interface DisposableHandle {
+public fun interface DisposableHandle {
     /**
      * Disposes the corresponding object, making it eligible for garbage collection.
      * Repeated invocation of this function has no effect.
      */
     public fun dispose()
 }
 
-/**
- * @suppress **This an internal API and should not be used from general code.**
- */
-@Suppress("FunctionName")
-@InternalCoroutinesApi
-public inline fun DisposableHandle(crossinline block: () -> Unit): DisposableHandle =
-    object : DisposableHandle {
-        override fun dispose() {
-            block()
-        }
-    }
-
 // -------------------- Parent-child communication --------------------
 
 /**