Suppress "unlikely argument type" warnings for IdString

These are fixed on master, but will not be fixed on the
stable branch. Suppress them just to get rid of them in
Eclipse.

This commit should be omitted when merging the branch
up to master.

Change-Id: Iae6e69e14c1fd346a9ea29779875bb00e43fdc8c
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/change/Revisions.java b/gerrit-server/src/main/java/com/google/gerrit/server/change/Revisions.java
index a16f2f9..6e5462aa 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/change/Revisions.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/change/Revisions.java
@@ -67,6 +67,7 @@
     throw new ResourceNotFoundException();
   }
 
+  @SuppressWarnings("unlikely-arg-type")
   @Override
   public RevisionResource parse(ChangeResource change, IdString id)
       throws ResourceNotFoundException, AuthException, OrmException, IOException {
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigCollection.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigCollection.java
index d5d2960..99d80ef 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigCollection.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigCollection.java
@@ -42,6 +42,7 @@
     return views;
   }
 
+  @SuppressWarnings("unlikely-arg-type")
   @Override
   public ConfigResource parse(TopLevelResource root, IdString id) throws ResourceNotFoundException {
     if (id.equals("server")) {