Added check for behavior feature existense

extensions/browser/extension_zoom_request_client.cc

 // Copyright 2014 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 "extensions/browser/extension_zoom_request_client.h"
 
 #include "extensions/common/features/behavior_feature.h"
+#include "extensions/common/features/feature.h"
 #include "extensions/common/features/feature_provider.h"
 
 namespace extensions {
 
 ExtensionZoomRequestClient::ExtensionZoomRequestClient(
     scoped_refptr<const Extension> extension)
     : extension_(extension) {
 }
 
 bool ExtensionZoomRequestClient::ShouldSuppressBubble() const {
-  return FeatureProvider::GetBehaviorFeature(
-             BehaviorFeature::kZoomWithoutBubble)
-      ->IsAvailableToExtension(extension())
-      .is_available();
+  const Feature* feature =
+      FeatureProvider::GetBehaviorFeature(BehaviorFeature::kZoomWithoutBubble);
+  return feature && feature->IsAvailableToExtension(extension()).is_available();
 }
 
 ExtensionZoomRequestClient::~ExtensionZoomRequestClient() {
 }
 
 }  // namespace Extensions