Adapt to upstream move of MenuItem

In I5b879c4f MenuItem was extracted to its own class.

Also update the plugin API to 2.13-SNAPSHOT which is the version which
contains the MenuItem in the new location.

Change-Id: I679a05125791f2de8ba9135263057d7d93d280d7
diff --git a/lib/gerrit/BUCK b/lib/gerrit/BUCK
index f1ab768..7571746 100644
--- a/lib/gerrit/BUCK
+++ b/lib/gerrit/BUCK
@@ -1,12 +1,11 @@
 include_defs('//bucklets/maven_jar.bucklet')
 
-VER = '2.12'
-REPO = MAVEN_CENTRAL
+VER = '2.13-SNAPSHOT'
+REPO = MAVEN_LOCAL
 
 maven_jar(
   name = 'plugin-api',
   id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
-  sha1 = '8ce1f6e65078bbcf03a1758f96b3ebca19b7fe3c',
   attach_source = False,
   repository = REPO,
   license = 'Apache2.0',
@@ -15,7 +14,6 @@
 maven_jar(
   name = 'gwtui-api',
   id = 'com.google.gerrit:gerrit-plugin-gwtui:' + VER,
-  sha1 = 'a7e7d82746b847678022242ec9eb44d1f16e8639',
   attach_source = False,
   repository = REPO,
   license = 'Apache2.0',
diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/ImportMenu.java b/src/main/java/com/googlesource/gerrit/plugins/importer/ImportMenu.java
index ad9c37c..f0b0976 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/ImportMenu.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/ImportMenu.java
@@ -16,6 +16,7 @@
 
 import com.google.common.collect.Lists;
 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.CurrentUser;
 import com.google.gerrit.server.account.CapabilityControl;