Guice Multibindings: follow-up to earlier CL to make MultimapBinder p…

…ackage-private so that Real{Provider}MultimapProvider.initialize are accessible by generated code

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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=72772135

extensions/multibindings/src/com/google/inject/multibindings/MapBinder.java

@@ -605,7 +605,7 @@ public List<Entry<?, Binding<?>>> getEntries() {
     /**
      * Binds {@code Map<K, Set<V>>} and {{@code Map<K, Set<Provider<V>>>}.
      */
-    private static final class MultimapBinder<K, V> implements Module {
+    static final class MultimapBinder<K, V> implements Module {
 
       private final Key<Map<K, Set<V>>> multimapKey;
       private final Key<Map<K, Set<Provider<V>>>> providerMultimapKey;