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

content/public/common/content_features.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 53 matching lines @@
 // Enables a blink::FontCache optimization that reuses a font to serve different
 // size of font.
 const base::Feature kFontCacheScaling{"FontCacheScaling",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables a security restriction on iframes navigating their top frame.
 // When enabled, the navigation will only be permitted if the iframe is
 // same-origin to the top frame, or if a user gesture is being processed.
 const base::Feature kFramebustingNeedsSameOriginOrUserGesture{
     "FramebustingNeedsSameOriginOrUserGesture",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables extended Gamepad API features like motion tracking and haptics.
 const base::Feature kGamepadExtensions{"GamepadExtensions",
                                        base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables sensors based on Generic Sensor API:
 // https://w3c.github.io/sensors/
 const base::Feature kGenericSensor{"GenericSensor",
                                    base::FEATURE_DISABLED_BY_DEFAULT};
 
@@ skipping 161 matching lines @@
 #endif
 
 #if defined(OS_WIN)
 // Emergency "off switch" for new Windows sandbox security mitigation,
 // sandbox::MITIGATION_EXTENSION_POINT_DISABLE.
 const base::Feature kWinSboxDisableExtensionPoints{
     "WinSboxDisableExtensionPoint", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features