Fix post commit comments for CL 11896028. Only nits.

chrome/browser/ui/content_settings/content_setting_bubble_model.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/ui/content_settings/content_setting_bubble_model.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/api/infobars/infobar_service.h"
 #include "chrome/browser/content_settings/content_settings_utils.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
@@ skipping 577 matching lines @@
   set_radio_group_enabled(true);
 }
 
 void ContentSettingMediaStreamBubbleModel::UpdateSettings(
     ContentSetting setting) {
   if (profile()) {
     HostContentSettingsMap* content_settings =
         profile()->GetHostContentSettingsMap();
     // The same patterns must be used as in other places (e.g. the infobar) in
     // order to override the existing rule. Otherwise a new rule is created.
-    // TODO(markusheintz): Extract to a helper so thath there is only a single
+    // TODO(markusheintz): Extract to a helper so that there is only a single
     // place to touch.
     ContentSettingsPattern primary_pattern =
         ContentSettingsPattern::FromURLNoWildcard(web_contents()->GetURL());
     ContentSettingsPattern secondary_pattern =
         ContentSettingsPattern::Wildcard();
     content_settings->SetContentSetting(
         primary_pattern, secondary_pattern,
-        CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC, "", setting);
+        CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC, std::string(), setting);
     content_settings->SetContentSetting(
         primary_pattern, secondary_pattern,
-        CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA, "", setting);
+        CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA, std::string(), setting);
   }
 }
 
 void ContentSettingMediaStreamBubbleModel::OnRadioClicked(int radio_index) {
   selected_item_ = radio_index;
 }
 
 class ContentSettingDomainListBubbleModel
     : public ContentSettingTitleAndLinkModel {
  public:
@@ skipping 331 matching lines @@
   if (type == content::NOTIFICATION_WEB_CONTENTS_DESTROYED) {
     DCHECK_EQ(web_contents_,
               content::Source<WebContents>(source).ptr());
     web_contents_ = NULL;
   } else {
     DCHECK_EQ(chrome::NOTIFICATION_PROFILE_DESTROYED, type);
     DCHECK_EQ(profile_, content::Source<Profile>(source).ptr());
     profile_ = NULL;
   }
 }