Adapt to changes in Gerrit core

In Ia177bc8cfd6 InternalGroup was moved to the entities package.

Change-Id: I21982e556152254a8abbf03cfd19ddf8b897913a
diff --git a/owners-common/src/main/java/com/googlesource/gerrit/owners/common/AccountsImpl.java b/owners-common/src/main/java/com/googlesource/gerrit/owners/common/AccountsImpl.java
index 52e2b58..07c3dad 100644
--- a/owners-common/src/main/java/com/googlesource/gerrit/owners/common/AccountsImpl.java
+++ b/owners-common/src/main/java/com/googlesource/gerrit/owners/common/AccountsImpl.java
@@ -21,6 +21,7 @@
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.Account.Id;
 import com.google.gerrit.entities.AccountGroup;
+import com.google.gerrit.entities.InternalGroup;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.account.AccountCache;
 import com.google.gerrit.server.account.AccountResolver;
@@ -28,7 +29,6 @@
 import com.google.gerrit.server.account.GroupCache;
 import com.google.gerrit.server.account.GroupMembers;
 import com.google.gerrit.server.account.externalids.ExternalId;
-import com.google.gerrit.server.group.InternalGroup;
 import com.google.gerrit.server.project.NoSuchProjectException;
 import com.google.gerrit.server.util.ManualRequestContext;
 import com.google.gerrit.server.util.OneOffRequestContext;