Create NavigationHandles for interstitials if needed

content/browser/loader/navigation_resource_throttle.h

Index: content/browser/loader/navigation_resource_throttle.h
diff --git a/content/browser/loader/navigation_resource_throttle.h b/content/browser/loader/navigation_resource_throttle.h
index 55a1da5d1519588327dd2f06a0196778fe728d15..744a2ca9dc899687225e886e892465d836baba56 100644
--- a/content/browser/loader/navigation_resource_throttle.h
+++ b/content/browser/loader/navigation_resource_throttle.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "content/public/browser/resource_throttle.h"
 #include "content/public/common/request_context_type.h"
@@ -36,6 +37,11 @@ class NavigationResourceThrottle : public ResourceThrottle {
   void WillProcessResponse(bool* defer) override;
   const char* GetNameForLogging() const override;
 
+  // Used in unit tests to make UI checks pass when they would fail due to no
+  // NavigationHandle being present in the RenderFrameHost.
+  CONTENT_EXPORT static void SetUIChecksAlwaysSucceedForTesting(
+      bool ui_checks_always_succeed);
+
  private:
   void OnUIChecksPerformed(NavigationThrottle::ThrottleCheckResult result);