GoogleURLTrackerInfoBarDelegate: Initialize uninitialized member in constructor

chrome/browser/google/google_url_tracker_infobar_delegate.cc

 // Copyright (c) 2012 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/browser/google/google_url_tracker_infobar_delegate.h"
 
 #include "chrome/browser/google/google_url_tracker.h"
 #include "chrome/browser/google/google_url_tracker_navigation_helper.h"
 #include "chrome/browser/google/google_util.h"
 #include "components/infobars/core/infobar.h"
@@ skipping 54 matching lines @@
 
   if (new_search_url.is_valid())
     navigation_helper->OpenURL(new_search_url, CURRENT_TAB, false);
 }
 
 GoogleURLTrackerInfoBarDelegate::GoogleURLTrackerInfoBarDelegate(
     GoogleURLTracker* google_url_tracker,
     const GURL& search_url)
     : ConfirmInfoBarDelegate(),
       google_url_tracker_(google_url_tracker),
+      navigation_helper_weak_ptr_(NULL),
       search_url_(search_url),
       pending_id_(0) {
 }
 
 GoogleURLTrackerInfoBarDelegate::~GoogleURLTrackerInfoBarDelegate() {
 }
 
 base::string16 GoogleURLTrackerInfoBarDelegate::GetMessageText() const {
   return l10n_util::GetStringFUTF16(
       IDS_GOOGLE_URL_TRACKER_INFOBAR_MESSAGE,
@@ skipping 26 matching lines @@
       (disposition == CURRENT_TAB) ? NEW_FOREGROUND_TAB : disposition,
       true);
   return false;
 }
 
 bool GoogleURLTrackerInfoBarDelegate::ShouldExpireInternal(
     const NavigationDetails& details) const {
   return (details.entry_id != contents_unique_id()) &&
       (details.entry_id != pending_id_);
 }