Detach SpeechRecognitionController upon page detach.

Source/platform/LifecycleNotifier.h

Index: Source/platform/LifecycleNotifier.h
diff --git a/Source/platform/LifecycleNotifier.h b/Source/platform/LifecycleNotifier.h
index 64fbb7998f0359ded1380771547e3b26109782e9..239c450eed805224746892a029f9d02dbc66703b 100644
--- a/Source/platform/LifecycleNotifier.h
+++ b/Source/platform/LifecycleNotifier.h
@@ -65,6 +65,8 @@ protected:
     {
     }
 
+    void detachObservers();
+
     Context* context() const { return m_context; }
 
     enum IterationType {
@@ -93,12 +95,18 @@ inline LifecycleNotifier<T>::~LifecycleNotifier()
     // ASSERT(!m_observers.size() || m_didCallContextDestroyed);
 
 #if !ENABLE(OILPAN)
+    detachObservers();
+#endif
+}
+
+template<typename T>
+inline void LifecycleNotifier<T>::detachObservers()
+{
     TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverAll);
     for (Observer* observer : m_observers) {
-        ASSERT(observer->lifecycleContext() == m_context);
+        ASSERT(!observer->lifecycleContext() || observer->lifecycleContext() == m_context);
         observer->clearLifecycleContext();
     }
-#endif
 }
 
 template<typename T>