Import MenuItem from its new location

Since I5b879c4f MenuItem was extracted in its own class.

Change-Id: I1e3bc20cf851a38e44a5b7a02bb44c5c796147ac
diff --git a/src/main/java/com/googlesource/gerrit/plugins/imagare/ImagareMenu.java b/src/main/java/com/googlesource/gerrit/plugins/imagare/ImagareMenu.java
index 975c6ae..2dbc0a9 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/imagare/ImagareMenu.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/imagare/ImagareMenu.java
@@ -15,6 +15,7 @@
 package com.googlesource.gerrit.plugins.imagare;
 
 import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.extensions.client.MenuItem;
 import com.google.gerrit.extensions.webui.TopMenu;
 import com.google.gerrit.server.config.PluginConfig;
 import com.google.gerrit.server.config.PluginConfigFactory;