Follow upstream's renaming of method to get current user

In gerrit's

  85f0487714e005b478eee5b28efab22bf5b7a5e2

commit, the getCurrentUser accessor got renamed to getUser. We follow
this move to allow compilation against gerrit master.

Bug: Issue 3619
Change-Id: Ib8798c3758e15f959c39e18610fc57685e13663c
diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/ChangeUpdatedListener.java b/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/ChangeUpdatedListener.java
index 0452273..bfe88e7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/ChangeUpdatedListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/ChangeUpdatedListener.java
@@ -129,7 +129,7 @@
               RequestContext old = tl.setContext(new RequestContext() {
 
                 @Override
-                public CurrentUser getCurrentUser() {
+                public CurrentUser getUser() {
                   return identifiedUserFactory.create(change.getOwner());
                 }