Tracing for NavigationHandle lifetime and state.

content/public/test/navigation_simulator.cc

Index: content/public/test/navigation_simulator.cc
diff --git a/content/public/test/navigation_simulator.cc b/content/public/test/navigation_simulator.cc
index a83df10f43ec10b9defb36a73927d412863e0d18..ac68c7260ace957dfc765c8e316bdb6b5cd72535 100644
--- a/content/public/test/navigation_simulator.cc
+++ b/content/public/test/navigation_simulator.cc
@@ -49,6 +49,10 @@ class NavigationThrottleCallbackRunner : public NavigationThrottle {
     return NavigationThrottle::PROCEED;
   }
 
+  const char* GetNameForLogging() override {
+    return "NavigationThrottleCallbackRunner";
+  }
+
  private:
   base::Closure on_will_start_request_;
   base::Closure on_will_redirect_request_;