Create a NavigationEntry for the initial blank page.

chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc

Index: chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc
diff --git a/chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc b/chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc
index 2bea5613d35ce767dfbdd82789a595793cc81fc1..c0cc2fcc8ea7958c9d578c5ee577ea256a0eab7e 100644
--- a/chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc
+++ b/chrome/browser/sync/sessions/sessions_sync_manager_unittest.cc
@@ -379,6 +379,11 @@ class SyncedTabDelegateFake : public SyncedTabDelegate {
                             blocked_navigations_(NULL) {}
   ~SyncedTabDelegateFake() override {}
 
+  bool IsInitialBlankNavigation() const override {
+    // This differs from NavigationControllerImpl, which has an initial blank
+    // NavigationEntry.
+    return GetEntryCount() == 0;
+  }
   int GetCurrentEntryIndex() const override { return current_entry_index_; }
   void set_current_entry_index(int i) {
     current_entry_index_ = i;