Remove migration of obsolete value for "session.restore_on_startup".

components/policy_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
   <message name="IDS_POLICY_DM_STATUS_SUCCESS" desc="Message indicating a successful device management server call.">
     Request succeeded
   </message>
   <message name="IDS_POLICY_DM_STATUS_REQUEST_INVALID" desc="Message indicating a bad request to the enterprise server.">
     Invalid request or request parameters
   </message>
   <message name="IDS_POLICY_DM_STATUS_REQUEST_FAILED" desc="Message indicating the request to the enterprise server failed in the network.">
@@ skipping 170 matching lines @@
   </message>
   <message name="IDS_POLICY_PROXY_NEITHER_SPECIFIED_ERROR" desc="The text displayed in the status column when neither a fixed proxy servers or a .pac url are specified.">
     Neither fixed proxy servers nor a .pac script URL are specified.
   </message>
   <message name="IDS_POLICY_OVERRIDDEN" desc="The text displayed in the status column when the corresponding policy is being ignored because another policy is overriding it.">
     Ignored because it was overridden by <ph name="POLICY_NAME">$1<ex>ProxyMode</ex></ph>.
   </message>
   <message name="IDS_POLICY_DEPRECATED" desc="The text displayed in the status column when the corresponding policy is deprecated.">
     This policy has been deprecated.
   </message>
-  <message name="IDS_POLICY_VALUE_DEPRECATED" desc="The text displayed in the status column when a specific value for a policy is deprecated.">
-    This value is deprecated for this policy.
-  </message>
   <if expr="chromeos">
     <message name="IDS_POLICY_NETWORK_CONFIG_PARSE_FAILED" desc="The text displayed in the status column when the corresponding network configuration policy failed to parse.">
       Network configuration failed to be parsed.
     </message>
     <message name="IDS_POLICY_NETWORK_CONFIG_IMPORT_PARTIAL" desc="The text displayed in the status column when the corresponding network configuration policy is not standard conform and was imported partially.">
       The network configuration doesn't comply to the ONC standard. Parts of the configuration may not be imported.
     </message>
     <message name="IDS_POLICY_NETWORK_CONFIG_IMPORT_FAILED" desc="The text displayed in the status column when the corresponding network configuration policy is invalid.">
       The network configuration is invalid and couldn't be imported.
     </message>
@@ skipping 109 matching lines @@
   <message name="IDS_POLICY_LEVEL_RECOMMENDED" desc="Text displayed in the Level column when a policy is recommended.">
     Recommended
   </message>
   <message name="IDS_POLICY_LEVEL_MANDATORY" desc="Text displayed in the Level column when a policy is mandatory.">
     Mandatory
   </message>
   <message name="IDS_POLICY_INVALID_BOOKMARK" desc="Text displayed in the status column when an entry of the ManagedBookmarks policy is not a valid bookmark.">
     Ignored invalid bookmark at index <ph name="ENTRY_INDEX">$1<ex>3</ex></ph>
   </message>
 </grit-part>