Ensure History > Recent Tabs restore preserves window disposition.

ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm

Index: ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
diff --git a/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
index a1a03f42bf1a628a827a322f9c53eee406412e2a..4f2404bef86351d325e09f081c32e26dffa4be73 100644
--- a/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
+++ b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
@@ -68,9 +68,25 @@ sessions::LiveTab* TabRestoreServiceDelegateImplIOS::GetActiveLiveTab() const {
 }
 
 bool TabRestoreServiceDelegateImplIOS::IsTabPinned(int index) const {
+  // Not supported by iOS.
   return false;
 }
 
+const gfx::Rect TabRestoreServiceDelegateImplIOS::GetRestoredBounds() const {
+  // Not supported by iOS.
+  return gfx::Rect();
+}
+
+ui::WindowShowState TabRestoreServiceDelegateImplIOS::GetRestoredState() const {
+  // Not supported by iOS.
+  return ui::SHOW_STATE_NORMAL;
+}
+
+std::string TabRestoreServiceDelegateImplIOS::GetWorkspace() const {
+  // Not supported by iOS.
+  return std::string();
+}
+
 sessions::LiveTab* TabRestoreServiceDelegateImplIOS::AddRestoredTab(
     const std::vector<sessions::SerializedNavigationEntry>& navigations,
     int tab_index,