deprecate the unused class which has external usages

platform/util/src/com/intellij/openapi/application/RuntimeInterruptedException.java

@@ -15,6 +15,10 @@
  */
 package com.intellij.openapi.application;
 
+/**
+ * @deprecated To remove in 2017.
+ */
+@Deprecated
 public class RuntimeInterruptedException extends RuntimeException {
   public RuntimeInterruptedException(InterruptedException cause) {
     super(cause);