Polish the appearance of the Controlled by Extension bubble.

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 b31418d97efb084ca3f6953a5ffb70d12146a9a6..6176b67a82b9049a48b330737b3179dbd0b0bff8 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -10396,8 +10396,8 @@ Would you like to start <ph name="CONTROL_PANEL_APPLET_NAME">$1<ex>Add/Remove Pr
         <message name="IDS_OPTIONS_CONTROLLED_SETTING_EXTENSION_WITH_NAME" desc="Text displayed in the controlled settings bubble when a setting's value is enforced by an extension. The name of the extension would be displayed on the following line, thus the ending with ':'.">
           This setting is controlled by:
         </message>
-        <message name="IDS_OPTIONS_CONTROLLED_SETTING_MANAGE_EXTENSIONS" desc="Text displayed for a link to manage extensions from the controlled settings bubble.">
-          Manage extensions
+        <message name="IDS_OPTIONS_CONTROLLED_SETTING_MANAGE_EXTENSION" desc="Text displayed for a link to manage extension from the controlled settings bubble.">
+          Manage extension
         </message>
         <message name="IDS_OPTIONS_CONTROLLED_SETTING_RECOMMENDED" desc="Text displayed in the controlled settings bubble when a value is recommended for a setting through policy and the user has not overridden this recommendation.">
           You are following the administrator's recommendation for this setting.