Make project metadata visible to anonymous users

Since we now permit showing the metadata about a project in a
non-editable format to non-owners of that project, lets finish
opening up the UI and permit anonymous users to also see the
metadata if they can see the project.

Change-Id: I7ed0620579f9778686242acdba28e225300bad00
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-common/src/main/java/com/google/gerrit/common/data/ProjectAdminService.java

@@ -29,10 +29,8 @@ import java.util.Set;
 
 @RpcImpl(version = Version.V2_0)
 public interface ProjectAdminService extends RemoteJsonService {
-  @SignInRequired
   void visibleProjects(AsyncCallback<List<Project>> callback);
 
-  @SignInRequired
   void projectDetail(Project.NameKey projectName,
       AsyncCallback<ProjectDetail> callback);
 
@@ -49,7 +47,6 @@ public interface ProjectAdminService extends RemoteJsonService {
       String groupName, String refName, short min, short max,
       AsyncCallback<ProjectDetail> callback);
 
-  @SignInRequired
   void listBranches(Project.NameKey projectName,
       AsyncCallback<ListBranchesResult> callback);