Make repost form warning tab-modal on Mac.

chrome/browser/tab_contents/navigation_controller.h

Index: chrome/browser/tab_contents/navigation_controller.h
diff --git a/chrome/browser/tab_contents/navigation_controller.h b/chrome/browser/tab_contents/navigation_controller.h
index 810f8b93d77b91255559916307423ebf12907861..ea8645d1288397c337b1556a17a39a0612c5e4d2 100644
--- a/chrome/browser/tab_contents/navigation_controller.h
+++ b/chrome/browser/tab_contents/navigation_controller.h
@@ -400,6 +400,11 @@ class NavigationController {
   }
   static size_t max_entry_count() { return max_entry_count_; }
 
+  // Cancels a repost that brought up a warning.
+  void CancelPendingReload();
+  // Continues a repost that brought up a warning.
+  void ContinuePendingReload();
+
  private:
   class RestoreHelper;
   friend class RestoreHelper;
@@ -557,6 +562,10 @@ class NavigationController {
   // The maximum number of entries that a navigation controller can store.
   static size_t max_entry_count_;
 
+  // If a repost is pending, its type (RELOAD or RELOAD_IGNORING_CACHE),
+  // NO_RELOAD otherwise.
+  ReloadType pending_reload_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationController);
 };