[sessions] Remove most knowledge of //chrome from core tab restore code

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 c2933220a22dfccb293597996cf24eaeefd6c5d9..e529751bb714387b9aff2c8db9c48cd0eee1af66 100644
--- a/components/sessions/core/tab_restore_service_client.h
+++ b/components/sessions/core/tab_restore_service_client.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_SESSIONS_CORE_TAB_RESTORE_SERVICE_CLIENT_H_
 
 #include "base/callback.h"
+#include "base/files/file_path.h"
 #include "base/memory/scoped_vector.h"
 #include "components/sessions/session_id.h"
 
@@ -17,6 +18,8 @@ namespace sessions {
 struct SessionWindow;
 }
 
+class GURL;
+
 namespace sessions {
 
 struct SessionWindow;
@@ -32,6 +35,12 @@ class TabRestoreServiceClient {
  public:
   virtual ~TabRestoreServiceClient() {}
 
+  // Returns the path of the directory to save state into.
+  virtual base::FilePath GetPathToSaveTo() = 0;
+
+  // Returns the URL that corresponds to the new tab page.
+  virtual GURL GetNewTabURL() = 0;
+
   // Returns whether there is a previous session to load.
   virtual bool HasLastSession() = 0;
 
@@ -40,6 +49,10 @@ class TabRestoreServiceClient {
   // it means the session could not be restored.
   virtual void GetLastSession(const GetLastSessionCallback& callback,
                               base::CancelableTaskTracker* tracker) = 0;
+
+  // Called when a tab is restored. |url| is the URL that the tab is currently
+  // visiting.
+  virtual void OnTabRestored(const GURL& url) {}
 };
 
 }  // namespace sessions