Reland v5 of Sessions Refactor

ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm

Index: ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm
diff --git a/ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm b/ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm
index df84d972776e0b59da8a02a901940af915744cc9..7959edd2168e056c9975bd7a1a4c49af2bfbb02c 100644
--- a/ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm
+++ b/ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.mm
@@ -18,7 +18,7 @@ TabModelSyncedWindowDelegatesGetter::~TabModelSyncedWindowDelegatesGetter() {}
 
 std::set<const sync_sessions::SyncedWindowDelegate*>
 TabModelSyncedWindowDelegatesGetter::GetSyncedWindowDelegates() {
-  std::set<const sync_sessions::SyncedWindowDelegate*> synced_window_delegates;
+  SyncedWindowDelegateMap synced_window_delegates;
 
   std::vector<ios::ChromeBrowserState*> browser_states =
       GetApplicationContext()
@@ -31,7 +31,8 @@ TabModelSyncedWindowDelegatesGetter::GetSyncedWindowDelegates() {
         GetTabModelsForChromeBrowserState(browser_state);
     for (TabModel* tabModel in tabModels) {
       if (tabModel.currentTab) {
-        synced_window_delegates.insert([tabModel syncedWindowDelegate]);
+        synced_window_delegates[tabModel->GetSessionId()] =
+            [tabModel syncedWindowDelegate];
       }
     }
   }