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

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc

Index: chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
diff --git a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
index 4049cc4b4fd6cf044128e28560846171a494af6f..e2e1b3dbe7a4f8e483247fd80a2561742e3e943b 100644
--- a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
+++ b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
@@ -17,8 +17,8 @@
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_delegate.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
-#include "chrome/browser/sync/glue/session_model_associator.h"
 #include "chrome/browser/sync/glue/synced_session.h"
+#include "chrome/browser/sync/open_tabs_ui_delegate.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/ui/browser.h"
@@ -167,10 +167,10 @@ const int RecentTabsSubMenuModel::kDisabledRecentlyClosedHeaderCommandId = 1121;
 RecentTabsSubMenuModel::RecentTabsSubMenuModel(
     ui::AcceleratorProvider* accelerator_provider,
     Browser* browser,
-    browser_sync::SessionModelAssociator* associator)
+    browser_sync::OpenTabsUIDelegate* delegate)
     : ui::SimpleMenuModel(this),
       browser_(browser),
-      associator_(associator),
+      open_tabs_(delegate),
       last_local_model_index_(-1),
       default_favicon_(ResourceBundle::GetSharedInstance().
           GetNativeImageNamed(IDR_DEFAULT_FAVICON)),
@@ -285,11 +285,11 @@ void RecentTabsSubMenuModel::ExecuteCommand(int command_id, int event_flags) {
                                   browser_->host_desktop_type(), disposition);
       }
     } else {  // Restore tab of session from other devices.
-      browser_sync::SessionModelAssociator* associator = GetModelAssociator();
-      if (!associator)
+      browser_sync::OpenTabsUIDelegate* open_tabs = GetOpenTabsUIDelegate();
+      if (!open_tabs)
         return;
       const SessionTab* tab;
-      if (!associator->GetForeignTab(item.session_tag, item.tab_id, &tab))
+      if (!open_tabs->GetForeignTab(item.session_tag, item.tab_id, &tab))
         return;
       if (tab->navigations.empty())
         return;
@@ -422,9 +422,9 @@ void RecentTabsSubMenuModel::BuildTabsFromOtherDevices() {
   // a menu item, because they are always only built once (i.e. invoked from
   // Constructor()) and don't change after that.
 
-  browser_sync::SessionModelAssociator* associator = GetModelAssociator();
+  browser_sync::OpenTabsUIDelegate* open_tabs = GetOpenTabsUIDelegate();
   std::vector<const browser_sync::SyncedSession*> sessions;
-  if (!associator || !associator->GetAllForeignSessions(&sessions)) {
+  if (!open_tabs || !open_tabs->GetAllForeignSessions(&sessions)) {
     AddSeparator(ui::NORMAL_SEPARATOR);
     AddItemWithStringId(IDC_RECENT_TABS_NO_DEVICE_TABS,
                         IDS_RECENT_TABS_NO_DEVICE_TABS);
@@ -443,7 +443,7 @@ void RecentTabsSubMenuModel::BuildTabsFromOtherDevices() {
 
     // Get windows of session.
     std::vector<const SessionWindow*> windows;
-    if (!associator->GetForeignSession(session_tag, &windows) ||
+    if (!open_tabs->GetForeignSession(session_tag, &windows) ||
         windows.empty()) {
       continue;
     }
@@ -588,10 +588,10 @@ void RecentTabsSubMenuModel::AddTabFavicon(int command_id, const GURL& url) {
     // --sync-tab-favicons switch is on; according to zea@, this flag is now
     // automatically enabled for iOS and android, and they're looking into
     // enabling it for other platforms.
-    browser_sync::SessionModelAssociator* associator = GetModelAssociator();
+    browser_sync::OpenTabsUIDelegate* open_tabs = GetOpenTabsUIDelegate();
     scoped_refptr<base::RefCountedMemory> favicon_png;
-    if (associator &&
-        associator->GetSyncedFaviconForPageURL(url.spec(), &favicon_png)) {
+    if (open_tabs &&
+        open_tabs->GetSyncedFaviconForPageURL(url.spec(), &favicon_png)) {
       gfx::Image image = gfx::Image::CreateFrom1xPNGBytes(favicon_png->front(),
                                                           favicon_png->size());
       SetIcon(index_in_menu, image);
@@ -660,16 +660,16 @@ void RecentTabsSubMenuModel::ClearLocalEntries() {
   local_window_items_.clear();
 }
 
-browser_sync::SessionModelAssociator*
-    RecentTabsSubMenuModel::GetModelAssociator() {
-  if (!associator_) {
+browser_sync::OpenTabsUIDelegate*
+    RecentTabsSubMenuModel::GetOpenTabsUIDelegate() {
+  if (!open_tabs_) {
     ProfileSyncService* service = ProfileSyncServiceFactory::GetInstance()->
         GetForProfile(browser_->profile());
-    // Only return the associator if it exists and it is done syncing sessions.
+    // Only return the delegate if it exists and it is done syncing sessions.
     if (service && service->ShouldPushChanges())
-      associator_ = service->GetSessionModelAssociator();
+      open_tabs_ = service->GetOpenTabsUIDelegate();
   }
-  return associator_;
+  return open_tabs_;
 }
 
 void RecentTabsSubMenuModel::TabRestoreServiceChanged(