Do not show pinned tabs on multiple instances

chrome/browser/ui/startup/startup_tab_provider.h

Index: chrome/browser/ui/startup/startup_tab_provider.h
diff --git a/chrome/browser/ui/startup/startup_tab_provider.h b/chrome/browser/ui/startup/startup_tab_provider.h
index 4ecc3aa3ae731914a948ddbc546979289ddf8451..fa87fd09cc2ce87b301f443e908e6a8753c30e95 100644
--- a/chrome/browser/ui/startup/startup_tab_provider.h
+++ b/chrome/browser/ui/startup/startup_tab_provider.h
@@ -92,8 +92,10 @@ class StartupTabProviderImpl : public StartupTabProvider {
   // Determines whether the startup preference requires the contents of
   // |pinned_tabs| to be shown. This is needed to avoid duplicates, as the
   // session restore logic will also resurface pinned tabs on its own.
-  static StartupTabs CheckPinnedTabPolicy(const SessionStartupPref& pref,
-                                          const StartupTabs& pinned_tabs);
+  static StartupTabs CheckPinnedTabPolicy(
+      const SessionStartupPref& pref,
+      const StartupTabs& pinned_tabs,
+      bool profile_has_other_tabbed_browser);
 
   // Determines whether preferences and window state indicate that
   // user-specified tabs should be shown as the default new window content, and