Eliminate BaseSessionServiceDelegateImpl

components/sessions/core/tab_restore_service_client.h

Index: components/sessions/core/tab_restore_service_client.h
diff --git a/components/sessions/core/tab_restore_service_client.h b/components/sessions/core/tab_restore_service_client.h
index e529751bb714387b9aff2c8db9c48cd0eee1af66..ce60f99f45c331d29315b2a68d63bbf5e2ec38c6 100644
--- a/components/sessions/core/tab_restore_service_client.h
+++ b/components/sessions/core/tab_restore_service_client.h
@@ -12,6 +12,7 @@
 
 namespace base {
 class CancelableTaskTracker;
+class SequencedWorkerPool;
 }
 
 namespace sessions {
@@ -35,6 +36,13 @@ class TabRestoreServiceClient {
  public:
   virtual ~TabRestoreServiceClient() {}
 
+  // Returns whether a given URL should be tracked for restoring.
+  virtual bool ShouldTrackURLForRestore(const GURL& url) = 0;
+
+  // Get the sequenced worker pool for running tasks on the backend thread as
+  // long as the system is not shutting down.
+  virtual base::SequencedWorkerPool* GetBlockingPool() = 0;
+
   // Returns the path of the directory to save state into.
   virtual base::FilePath GetPathToSaveTo() = 0;