Revert 284322 "Allow EmbedRoot to be called multiple times."

trunk/src/mojo/services/view_manager/test_change_tracker.cc

Index: trunk/src/mojo/services/view_manager/test_change_tracker.cc
===================================================================
--- trunk/src/mojo/services/view_manager/test_change_tracker.cc	(revision 284322)
+++ trunk/src/mojo/services/view_manager/test_change_tracker.cc	(working copy)
@@ -80,8 +80,6 @@
           "InputEvent view=%s event_action=%d",
           NodeIdToString(change.view_id).c_str(),
           change.event_action);
-    case CHANGE_TYPE_EMBED_ROOT:
-      return base::StringPrintf("EmbedRoot url=%s", change.embed_url.data());
   }
   return std::string();
 }
@@ -225,13 +223,6 @@
   AddChange(change);
 }
 
-void TestChangeTracker::OnEmbedRoot(const String& url) {
-  Change change;
-  change.type = CHANGE_TYPE_EMBED_ROOT;
-  change.embed_url = url;
-  AddChange(change);
-}
-
 void TestChangeTracker::AddChange(const Change& change) {
   changes_.push_back(change);
   if (delegate_)