Suppress JavaScript dialogs when a tab puts itself into fullscreen.

chrome/browser/ui/fast_unload_controller.cc

Index: chrome/browser/ui/fast_unload_controller.cc
diff --git a/chrome/browser/ui/fast_unload_controller.cc b/chrome/browser/ui/fast_unload_controller.cc
index f0577567cf6954b3b9301a5314ab721e5a3b683d..94b0ce3004f518e9a6bc0cfa62c24a9944a87249 100644
--- a/chrome/browser/ui/fast_unload_controller.cc
+++ b/chrome/browser/ui/fast_unload_controller.cc
@@ -36,7 +36,8 @@ class FastUnloadController::DetachedWebContentsDelegate
 
  private:
   // WebContentsDelegate implementation.
-  bool ShouldSuppressDialogs(content::WebContents* source) override {
+  bool ShouldSuppressDialogs(content::WebContents* source,
+                             bool before_unload) override {
     return true;  // Return true so dialogs are suppressed.
   }