Restrict EventRouter::Get/Set-RegisteredEvents.

chrome/browser/extensions/installed_loader.cc

Index: chrome/browser/extensions/installed_loader.cc
diff --git a/chrome/browser/extensions/installed_loader.cc b/chrome/browser/extensions/installed_loader.cc
index efb5b25a3176b3aa71bcc989c39e8ebb6ec7b438..9e7a70d25a3a2384d56ef350f7e5e3ad8ee4a34e 100644
--- a/chrome/browser/extensions/installed_loader.cc
+++ b/chrome/browser/extensions/installed_loader.cc
@@ -446,8 +446,8 @@ void InstalledLoader::RecordExtensionsMetrics() {
         // Count extension event pages with no registered events. Either the
         // event page is badly designed, or there may be a bug where the event
         // page failed to start after an update (crbug.com/469361).
-        if (EventRouter::Get(extension_service_->profile())->
-                GetRegisteredEvents(extension->id()).size() == 0) {
+        if (!EventRouter::Get(extension_service_->profile())
+                 ->HasRegisteredEvents(extension->id())) {
           ++eventless_event_pages_count;
           VLOG(1) << "Event page without registered event listeners: "
                   << extension->id() << " " << extension->name();