Made the NavigationTracingObserver always be active whenever background tracing is active

content/public/browser/background_tracing_manager.h

Index: content/public/browser/background_tracing_manager.h
diff --git a/content/public/browser/background_tracing_manager.h b/content/public/browser/background_tracing_manager.h
index 0c4bf28a443151f8472eb27d0abe3f9e77e978f7..ba3d99ce79a2a47d60486fdd703a4da24ce95872 100644
--- a/content/public/browser/background_tracing_manager.h
+++ b/content/public/browser/background_tracing_manager.h
@@ -87,11 +87,12 @@ class BackgroundTracingManager {
   // be passed to DidTriggerHappen().
   virtual TriggerHandle RegisterTriggerType(const char* trigger_name) = 0;
 
+  virtual bool HasActiveScenario() = 0;
+
   virtual void InvalidateTriggerHandlesForTesting() = 0;
   virtual void SetTracingEnabledCallbackForTesting(
       const base::Closure& callback) = 0;
   virtual void FireTimerForTesting() = 0;
-  virtual bool HasActiveScenarioForTesting() = 0;
 
  protected:
   virtual ~BackgroundTracingManager() {}