Change event routers from singletons to being owned by the ExtensionService.

chrome/browser/extensions/extension_cookies_api.cc

Index: chrome/browser/extensions/extension_cookies_api.cc
diff --git a/chrome/browser/extensions/extension_cookies_api.cc b/chrome/browser/extensions/extension_cookies_api.cc
index 83c535db7c6e5e2f117f585fd4e0037a51475194..d5eabaa1abacc20e6d811b46402e09f300efa1e9 100644
--- a/chrome/browser/extensions/extension_cookies_api.cc
+++ b/chrome/browser/extensions/extension_cookies_api.cc
@@ -25,10 +25,9 @@
 
 namespace keys = extension_cookies_api_constants;
 
-// static
-ExtensionCookiesEventRouter* ExtensionCookiesEventRouter::GetInstance() {
-  return Singleton<ExtensionCookiesEventRouter>::get();
-}
+ExtensionCookiesEventRouter::ExtensionCookiesEventRouter() {}
+
+ExtensionCookiesEventRouter::~ExtensionCookiesEventRouter() {}
 
 void ExtensionCookiesEventRouter::Init() {
   if (registrar_.IsEmpty()) {