Require explicit selection of traits for LazyInstance

extensions/browser/browser_context_keyed_api_factory.h

Index: extensions/browser/browser_context_keyed_api_factory.h
diff --git a/extensions/browser/browser_context_keyed_api_factory.h b/extensions/browser/browser_context_keyed_api_factory.h
index 47a19a0d47fecedeec2f32b5239d6c37c910e6be..1316c08875870e9263f000909b929389661d860b 100644
--- a/extensions/browser/browser_context_keyed_api_factory.h
+++ b/extensions/browser/browser_context_keyed_api_factory.h
@@ -56,8 +56,8 @@ class BrowserContextKeyedAPI : public KeyedService {
   //   };
   //
   // In the cc file, provide the implementation, e.g.:
-  //   static base::LazyInstance<BrowserContextKeyedAPIFactory<HistoryAPI> >
-  //   g_factory = LAZY_INSTANCE_INITIALIZER;
+  //   static base::LazyInstance<BrowserContextKeyedAPIFactory<HistoryAPI>>::
+  //      DestructorAtExit g_factory = LAZY_INSTANCE_INITIALIZER;

[Nico, 2017/03/07 21:43:02]

should this recommend the leaky version?

[scottmg, 2017/03/07 21:56:30]

I changed the lazy_instance.h one to recommend leaky, but I'm not sure about the
details of a BrowserContextKeyedAPIFactory so I'll leave it as a
"behaviour-maintaining" recommendation for now.

   //
   //   // static
   //   BrowserContextKeyedAPIFactory<HistoryAPI>*