Revert of [subresource_filter] Remove Forwarding NavigationThrottles

content/public/test/navigation_simulator.h

Index: content/public/test/navigation_simulator.h
diff --git a/content/public/test/navigation_simulator.h b/content/public/test/navigation_simulator.h
index 2c33c61b1ef46912612f582358c8a07eeaa593cd..ac76f92e8d9b5bafb2c4ca59ea7caee0cc6b4ea7 100644
--- a/content/public/test/navigation_simulator.h
+++ b/content/public/test/navigation_simulator.h
@@ -19,7 +19,6 @@
 
 namespace content {
 
-class NavigationHandle;
 class NavigationHandleImpl;
 class RenderFrameHost;
 class TestRenderFrameHost;
@@ -146,11 +145,6 @@
   // It is an error to call this before Start() is called.
   virtual NavigationThrottle::ThrottleCheckResult GetLastThrottleCheckResult();
 
-  // Returns the NavigationHandle associated with the navigation being
-  // simulated. It is an error to call this before Start() or after the
-  // navigation has finished (successfully or not).
-  virtual NavigationHandle* GetNavigationHandle() const;
-
  private:
   // WebContentsObserver:
   void DidStartNavigation(NavigationHandle* navigation_handle) override;