Add support for resetting KeyedServices

These services meant to be initialized once in chrome.
We may want to reinit them if the profile's storage path changes.
Expose KeyedServiceFactory::Disassociate so we can shutdown
services at runtime.

Change-Id: I585540bb419609a6058f924dba0e7f6ac7e013a6
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/605522
Reviewed-by: Szabolcs David <[email protected]>

Author: mnegyokru

chromium/components/keyed_service/core/keyed_service_factory.cc

@@ -155,3 +155,10 @@ int KeyedServiceFactory::GetServicesCount(void* context) {
   auto it = GetKeyedServicesCount().find(context);
   return it != GetKeyedServicesCount().end() ? it->second : 0;
 }
+
+#if BUILDFLAG(IS_QTWEBENGINE)
+void KeyedServiceFactory::RemoveFromBrowserContext(void* context)
+{
+  Disassociate(context);
+}
+#endif

chromium/components/keyed_service/core/keyed_service_factory.h

@@ -33,6 +33,10 @@ class KEYED_SERVICE_EXPORT KeyedServiceFactory
   // context.
   static int GetServicesCount(void* context);
 
+#if BUILDFLAG(IS_QTWEBENGINE)
+  void RemoveFromBrowserContext(void* context);
+#endif
+
  protected:
   KeyedServiceFactory(const char* name, DependencyManager* manager, Type type);
   ~KeyedServiceFactory() override;