Discard geolocation update if dispatcher is not updating.

chrome/renderer/geolocation_dispatcher.cc

Index: chrome/renderer/geolocation_dispatcher.cc
diff --git a/chrome/renderer/geolocation_dispatcher.cc b/chrome/renderer/geolocation_dispatcher.cc
index e944673f7fe01874ba8893dba5b82e6c47ec8c45..aefc346c16154cfe81ff31aca596135afe345a37 100644
--- a/chrome/renderer/geolocation_dispatcher.cc
+++ b/chrome/renderer/geolocation_dispatcher.cc
@@ -113,7 +113,11 @@ void GeolocationDispatcher::OnGeolocationPermissionSet(
 // We have an updated geolocation position or error code.
 void GeolocationDispatcher::OnGeolocationPositionUpdated(
     const Geoposition& geoposition) {
-  DCHECK(updating_);
+  // It is possible for the browser process to have queued an update message
+  // before receiving the stop updating message.
+  if (!updating_)
+    return;
+
   DCHECK(geoposition.IsInitialized());
   if (geoposition.IsValidFix()) {
     controller_->positionChanged(