[Sync] Introduce SyncedSessionWindow type.

chrome/browser/android/foreign_session_helper.cc

Index: chrome/browser/android/foreign_session_helper.cc
diff --git a/chrome/browser/android/foreign_session_helper.cc b/chrome/browser/android/foreign_session_helper.cc
index 17006b71dad6c0b7854972b5c587a1d29a19f936..a4177ca4b6f70b934d6b65f571f52de0c1a270f3 100644
--- a/chrome/browser/android/foreign_session_helper.cc
+++ b/chrome/browser/android/foreign_session_helper.cc
@@ -75,7 +75,7 @@ bool ShouldSkipWindow(const sessions::SessionWindow& window) {
 
 bool ShouldSkipSession(const SyncedSession& session) {
   for (const auto& window_pair : session.windows) {
-    const sessions::SessionWindow& window = *(window_pair.second.get());
+    const sessions::SessionWindow& window = window_pair.second->wrapped_window;
     if (!ShouldSkipWindow(window))
       return false;
   }
@@ -120,7 +120,7 @@ void CopySessionToJava(
     const SyncedSession& session,
     ScopedJavaLocalRef<jobject>& j_session) {
   for (const auto& window_pair : session.windows) {
-    const sessions::SessionWindow& window = *(window_pair.second.get());
+    const sessions::SessionWindow& window = window_pair.second->wrapped_window;
 
     if (ShouldSkipWindow(window))
       continue;