Fix an unititialized variable that caused a mac valgrind failure....

chrome/browser/cocoa/content_settings_dialog_controller.mm

 // 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.
 
 #import "chrome/browser/cocoa/content_settings_dialog_controller.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "app/l10n_util.h"
 #include "base/mac_util.h"
@@ skipping 56 matching lines @@
 - (void)prefChanged:(std::wstring*)prefName;
 
 @end
 
 namespace ContentSettingsDialogControllerInternal {
 
 // A C++ class registered for changes in preferences.
 class PrefObserverBridge : public NotificationObserver {
  public:
   PrefObserverBridge(ContentSettingsDialogController* controller)
-      : controller_(controller) {}
+      : controller_(controller), disabled_(false) {}
 
   virtual ~PrefObserverBridge() {}
 
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details) {
     if (!disabled_ && type == NotificationType::PREF_CHANGED) {
       [controller_ prefChanged:Details<std::wstring>(details).ptr()];
     }
   }
@@ skipping 388 matching lines @@
     [self willChangeValueForKey:@"popupsEnabledIndex"];
     [self didChangeValueForKey:@"popupsEnabledIndex"];
   }
   if (*prefName == prefs::kGeolocationDefaultContentSetting) {
     [self willChangeValueForKey:@"geolocationSettingIndex"];
     [self didChangeValueForKey:@"geolocationSettingIndex"];
   }
 }
 
 @end