Linux: Fix regression with --kiosk.

chrome/browser/ui/startup/startup_browser_creator_impl.h

Index: chrome/browser/ui/startup/startup_browser_creator_impl.h
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.h b/chrome/browser/ui/startup/startup_browser_creator_impl.h
index 8103e208e2145bb205fba476f4540029cfd4c912..4a96ac6e4a2b2a235ccbb4488184ea7923d5aa30 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.h
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.h
@@ -101,19 +101,19 @@ class StartupBrowserCreatorImpl {
   // . If |process_startup| is false, restore the last session if necessary,
   //   or invoke ProcessSpecifiedURLs.
   // . Open the urls directly.
-  void ProcessLaunchURLs(bool process_startup,
-                         const std::vector<GURL>& urls_to_open,
-                         chrome::HostDesktopType desktop_type);
+  // Returns the Browser that processed |urls_to_open|.
+  Browser* ProcessLaunchURLs(bool process_startup,
+                             const std::vector<GURL>& urls_to_open,
+                             chrome::HostDesktopType desktop_type);
 
   // Does the following:
   // . If the user's startup pref is to restore the last session (or the
   //   command line flag is present to force using last session), it is
   //   restored.
   // . Otherwise invoke ProcessSpecifiedURLs
-  // If a browser was created, true is returned.  Otherwise returns false and
-  // the caller must create a new browser.
-  bool ProcessStartupURLs(const std::vector<GURL>& urls_to_open,
-                          chrome::HostDesktopType desktop_type);
+  // Returns a pointer to a Browser if one was created, otherwise nullptr.
+  Browser* ProcessStartupURLs(const std::vector<GURL>& urls_to_open,
+                              chrome::HostDesktopType desktop_type);
 
   // Invoked from either ProcessLaunchURLs or ProcessStartupURLs to handle
   // processing of URLs where the behavior is common between process startup