Discard geolocation update if dispatcher is not updating.

chrome/renderer/geolocation_dispatcher.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/geolocation_dispatcher.h"
 
 #include "chrome/renderer/render_view.h"
 #include "ipc/ipc_message.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebGeolocationPermissionRequest.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebGeolocationPermissionRequestManager.h"
@@ skipping 95 matching lines @@
     int bridge_id, bool is_allowed) {
   WebGeolocationPermissionRequest permissionRequest;
   if (!pending_permissions_->remove(bridge_id, permissionRequest))
     return;
   permissionRequest.setIsAllowed(is_allowed);
 }
 
 // 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(
         WebGeolocationPosition(
             geoposition.timestamp.ToDoubleT() * 1000.0,
             geoposition.latitude, geoposition.longitude,
             geoposition.accuracy,
             geoposition.is_valid_altitude(), geoposition.altitude,
             geoposition.is_valid_altitude_accuracy(),
             geoposition.altitude_accuracy,
@@ skipping 11 matching lines @@
       default:
         DCHECK(false);
         NOTREACHED() << geoposition.error_code;
         return;
     }
     controller_->errorOccurred(
         WebGeolocationError(
             code, WebKit::WebString::fromUTF8(geoposition.error_message)));
   }
 }