Add a lock to the managed user settings page and require authentication for unlocking.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b0663866123e0abed1bc30f8d87958bb83637b01..a9bab432376a21b9ce83854360f9edc7c5f92b08 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -8256,16 +8256,16 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
       <message name="IDS_OPTIONS_MANAGED_USERS_SECTION_TITLE" desc="Title for the Managed User section">
         Managed User
       </message>
-      <message name="IDS_MANAGED_USER_SETTINGS_TITLE" desc="Title for the Managed User Settings dialog">
+      <message name="IDS_MANAGED_USER_SETTINGS_TITLE" desc="Title for the Managed User Settings dialog.">
         Managed User Settings
       </message>
-      <message name="IDS_INSTALLED_CONTENT_PACKS_LABEL" desc="Label for installed whitelists on the Managed User Settings dialog">
+      <message name="IDS_INSTALLED_CONTENT_PACKS_LABEL" desc="Label for installed whitelists on the Managed User Settings dialog.">
         Installed and enabled content packs:
       </message>
       <message name="IDS_GET_CONTENT_PACKS_BUTTON" desc="The text for the button that opens the webstore, Content pack section.">
         Get Content Packs
       </message>
-      <message name="IDS_CONTENT_PACK_SETTINGS_LABEL" desc="Label that explains the three options associated with installed whitelists on the Managed User Settings dialog">
+      <message name="IDS_CONTENT_PACK_SETTINGS_LABEL" desc="Label that explains the three options associated with installed whitelists on the Managed User Settings dialog.">
         When a managed user tries to access a site that is not in any content pack:
       </message>
       <message name="IDS_OUTSIDE_CONTENT_PACKS_ALLOW_RADIO" desc="A radio button in the Managed User Settings dialog for allowing a managed user to view sites that do not belong to the installed whitelists.">
@@ -8280,7 +8280,7 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
        <message name="IDS_ADVANCED_MANAGED_USER_LABEL" desc="A label in the Managed User Settings dialog for other managed user settings.">
         Advanced settings
       </message>
-       <message name="IDS_SAFE_SEARCH_ENABLED" desc="A checkbox in the Managed User Settings dialog for enabling SafeSearch">
+       <message name="IDS_SAFE_SEARCH_ENABLED" desc="A checkbox in the Managed User Settings dialog for enabling SafeSearch.">
         Enable Google's SafeSearch
       </message>
        <message name="IDS_SIGNIN_SYNC_DISABLED" desc="A checkbox in the Managed User Settings dialog for disabling sign in or sync.">