[Sync] Fix namespaces for the sync_sessions component.

chrome/browser/ui/sync/browser_synced_window_delegates_getter.h

Index: chrome/browser/ui/sync/browser_synced_window_delegates_getter.h
diff --git a/chrome/browser/ui/sync/browser_synced_window_delegates_getter.h b/chrome/browser/ui/sync/browser_synced_window_delegates_getter.h
index a1089c7d9b99b944f956fc14171cb166c4840a99..806d5e65515cb4cd3f7798ad5ac167324cd967a4 100644
--- a/chrome/browser/ui/sync/browser_synced_window_delegates_getter.h
+++ b/chrome/browser/ui/sync/browser_synced_window_delegates_getter.h
@@ -15,17 +15,18 @@ class Profile;
 
 namespace browser_sync {
 
-class SyncedWindowDelegate;
-
 // This class defines how to access SyncedWindowDelegates on desktop.
-class BrowserSyncedWindowDelegatesGetter : public SyncedWindowDelegatesGetter {
+class BrowserSyncedWindowDelegatesGetter
+    : public sync_sessions::SyncedWindowDelegatesGetter {
  public:
   explicit BrowserSyncedWindowDelegatesGetter(Profile* profile);
   ~BrowserSyncedWindowDelegatesGetter() override;
 
   // SyncedWindowDelegatesGetter implementation
-  std::set<const SyncedWindowDelegate*> GetSyncedWindowDelegates() override;
-  const SyncedWindowDelegate* FindById(SessionID::id_type id) override;
+  std::set<const sync_sessions::SyncedWindowDelegate*>
+  GetSyncedWindowDelegates() override;
+  const sync_sessions::SyncedWindowDelegate* FindById(
+      SessionID::id_type id) override;
 
  private:
   Profile* const profile_;