Add desktop type context to most existing instances of FindTabbedBrowser.

chrome/browser/ui/browser_navigator.h

Index: chrome/browser/ui/browser_navigator.h
diff --git a/chrome/browser/ui/browser_navigator.h b/chrome/browser/ui/browser_navigator.h
index 4efd06d30ddd2ed1544e0e940aba2038dd29d873..a91457c6f46968bef72ce4dc05b50aa970c615bb 100644
--- a/chrome/browser/ui/browser_navigator.h
+++ b/chrome/browser/ui/browser_navigator.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "chrome/browser/ui/host_desktop.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/common/page_transition_types.h"
 #include "content/public/common/referrer.h"
@@ -197,6 +198,10 @@ struct NavigateParams {
   // to a different site that created a new RVH.
   content::GlobalRequestID transferred_global_request_id;
 
+  // Refers to which desktop this navigation should occur on. May be passed
+  // explicitly or inferred from an existing Browser instance.
+  chrome::HostDesktopType host_desktop_type;
+
  private:
   NavigateParams();
 };