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 24d45023bd3204c962d8047961682ac3af34e9e4..d3d14ce33030504e3b1ad251e5da9f2f74c0024e 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -8071,6 +8071,23 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
         Clearing...
       </message>
 
+      <!--Family Control passphrase dialog data -->
+      <message name="IDS_PASSPHRASE_TITLE" desc="A title for the passphrase page to unlock family control settings.">
+        Unlock
+      </message>
+      <message name="IDS_PASSPHRASE_INSTRUCTION" desc="Instruction to enter an unlock passphrase to unlock family control settings.">
+        Enter passphrase to unlock managed user settings

[Pam (message me for reviews), 2013/01/07 14:51:49]

For the description: where does this message appear?
For the message: Should it end in a period (.)? (If not, then should
IDS_SET_PASSPHRASE_INSTRUCTIONS still have one?)

+      </message>
+      <message name="IDS_UNLOCK_PASSPHRASE_BUTTON" desc="A button for unclocking the family control settings page.">

[Pam (message me for reviews), 2013/01/07 14:51:49]

Typo: "unclocking"

+        Unlock
+      </message>
+       <message name="IDS_FORGOT_PASSPHRASE" desc="A link to recover forgotten passphrase.">
+        Forgot passphrase?
+      </message>
+      <message name="IDS_INCORRECT_PASSPHRASE_WARNING" desc="A warning for the passphrase page if the incorrect passphrase was entered.">
+        The passphrase you entered is incorrect.
+      </message>
+
       <!-- Managed User Settings dialog data -->
       <message name="IDS_MANAGED_USER_SETTINGS_TITLE" desc="Title for the Managed User Settings dialog">
         Managed User Settings
@@ -8111,6 +8128,21 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
       <message name="IDS_SET_PASSPHRASE_BUTTON" desc="A button in the Managed User Settings dialog to set the passphrase to access other profiles">
         Set passphrase
       </message>
+      <message name="IDS_SET_PASSPHRASE_TITLE" desc="XXX">

[Pam (message me for reviews), 2013/01/07 14:51:49]

Please add descriptions to replace these two XXX.

+        Set a passphrase
+      </message>
+      <message name="IDS_SET_PASSPHRASE_INSTRUCTIONS" desc="XXX">
+        Set a passphrase to access managed user settings and other profiles.
+      </message>
+      <message name="IDS_ENTER_PASSPHRASE_LABEL" desc="A label for entering a passphrase to save.">
+        Enter a passphrase:
+      </message>
+       <message name="IDS_CONFIRM_PASSPHRASE_LABEL" desc="A label for re-entering a passphrase to save.">
+        Confirm the passphrase:
+      </message>
+      <message name="IDS_SAVE_PASSPHRASE_BUTTON" desc="A label for saving the passhrase to lock a managed mode user.">

[Pam (message me for reviews), 2013/01/07 14:51:49]

I'd suggest "A button label..."

+        Save
+      </message>
 
       <!-- Managed Mode Block Interstitial data -->
       <message name="IDS_BLOCK_INTERSTITIAL_TITLE" desc="A title for the managed mode block interstitial page.">