Moved AlternativeSignatureMismatchException since it is the internal part of it now.

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/AlternativeSignatureData.java

@@ -378,4 +378,10 @@ class AlternativeSignatureData {
                     method.getName(), altFunDeclaration.getName()));
         }
     }
+
+    private static class AlternativeSignatureMismatchException extends Exception {
+        private AlternativeSignatureMismatchException(String message) {
+            super(message);
+        }
+    }
 }

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/AlternativeSignatureMismatchException.java

@@ -1,23 +0,0 @@
-/*
- * Copyright 2010-2012 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.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.jet.lang.resolve.java;
-
-public class AlternativeSignatureMismatchException extends Exception {
-    public AlternativeSignatureMismatchException(String message) {
-        super(message);
-    }
-}