Turn on the flag for 'allow-top-navigation-by-user-activation'.

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5

 {
   // http://dev.chromium.org/blink/runtime-enabled-features
   //
   // This list is used to generate RuntimeEnabledFeatures.h/cpp which contains
   // a class that stores static enablers for all experimental features.
 
   parameters: {
     // Each feature can be assigned a "status":
     // status=stable -> Enable this in all Blink configurations.  We are committed to these APIs indefinitely.
     // status=experimental -> In-progress features, Web Developers might play with, but are not on by default in stable.
@@ skipping 837 matching lines @@
     {
       name: "TimerThrottlingForBackgroundTabs",
       status: "stable",
     },
     {
       name: "TimerThrottlingForHiddenFrames",
       status: "stable",
     },
     {
       name: "TopNavByUserActivationInSandbox",
-      status: "experimental",
+      status: "stable",
     },
     // Many websites disable mouse support when touch APIs are available.  We'd
     // like to enable this always but can't until more websites fix this bug.
     // Chromium sets this conditionally (eg. based on the presence of a
     // touchscreen) in ApplyWebPreferences. "Touch events" themselves are always
     // enabled since they're a feature always supported by Chrome.
     {
       name: "TouchEventFeatureDetection",
       status: "stable",
     },
@@ skipping 149 matching lines @@
     {
       name: "RestrictCompleteURLCharacterSet",
       status: "experimental",
     },
     {
       name: "BlockLegacySubresources",
       status: "experimental",
     }
   ],
 }