Cleanup (unused imports; warnings; formatting)

java/java-psi-api/src/com/intellij/psi/PsiImportHolder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,9 +15,6 @@
  */
 package com.intellij.psi;
 
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
 /**
  * Represents a file or code fragment to which import statements can be added.
  */
@@ -29,4 +26,4 @@ public interface PsiImportHolder extends PsiFile {
    * @return true if the import statement was added successfully, false otherwise.
    */
   boolean importClass(PsiClass aClass);
-}
+}