Fix `repo manifest` support of remote aliases.

Long story short, w/out this modification the manifest dump points
at the alias, rather than the actual remote for the project.  This
breaks sync'ing for scenarios where the alias doesn't have the same
repos available as the remote, plus just plain is wrong.

Change-Id: I7150e449341ed8655d398956a095261978d95870

manifest_xml.py

@@ -82,8 +82,6 @@ class _XmlRemote(object):
   def ToRemoteSpec(self, projectName):
     url = self.resolvedFetchUrl.rstrip('/') + '/' + projectName
     remoteName = self.name
-    if self.remoteAlias:
-      remoteName = self.remoteAlias
     return RemoteSpec(remoteName, url, self.reviewUrl)
 
 class XmlManifest(object):