Reenable framebusting deprecation, change it to allow navigation if iframe has ever had a user gestu

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index 67ff7ca2eee5792ba26c4f2bac9b60a00a32501a..a376e1ca1b24dd60eee8ce7fa4c441bbbc83072c 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -7111,6 +7111,10 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
       "parent.location = '%s');",
       b_url.spec().c_str());
 
+  // Ensure the child has received a user gesture, so that it has permission
+  // to framebust.
+  SimulateMouseClick(
+      root->child_at(0)->current_frame_host()->GetRenderWidgetHost(), 1, 1);
   TestFrameNavigationObserver frame_observer(root);
   EXPECT_TRUE(ExecuteScript(root->child_at(0), script));
   frame_observer.Wait();