sync: Add --enable-sync-sessions-v2 and necessary plumbing to use SessionsSyncManager.

chrome/browser/sync/open_tabs_ui_delegate.cc

Index: chrome/browser/sync/open_tabs_ui_delegate.cc
diff --git a/chrome/browser/sync/glue/sync_frontend.cc b/chrome/browser/sync/open_tabs_ui_delegate.cc
similarity index 65%
copy from chrome/browser/sync/glue/sync_frontend.cc
copy to chrome/browser/sync/open_tabs_ui_delegate.cc
index 8241c74db443035c30ecf39ec1dcc3815d3ed1dc..fe0773377f77f225c1e784a30de7c02594a2af05 100644
--- a/chrome/browser/sync/glue/sync_frontend.cc
+++ b/chrome/browser/sync/open_tabs_ui_delegate.cc
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/sync/glue/sync_frontend.h"
+#include "chrome/browser/sync/open_tabs_ui_delegate.h"
 
 namespace browser_sync {
 
-SyncFrontend::SyncFrontend() {}
-
-SyncFrontend::~SyncFrontend() {}
+OpenTabsUIDelegate::~OpenTabsUIDelegate() {}
 
 }  // namespace browser_sync