Remove the managed banner from the Chrome settings UI

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <!-- Idle Logout Dialog Strings -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog">
     Are you still there?
   </message>
   <message name="IDS_IDLE_LOGOUT_WARNING_RESTART" desc="Restart label for the idle logout dialog">
     This computer will reset in <ph name="LOGOUT_TIME_LEFT">$1<ex>20</ex></ph> seconds.
@@ skipping 1147 matching lines @@
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_GATEWAY" desc="In settings Internet options, the label for gateway.">
     Gateway:
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_DNSSERVER" desc="In settings Internet options, the label dns server.">
     DNS server:
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_CHANGE_PROXY_BUTTON" desc="In settings Internet options, the button to configure proxy settings.">
     Change proxy settings...
   </message>
-  <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_ENABLE_SHARED_PROXIES_HINT" desc="In settings Internet options, when proxy can't be changed, the hint for user to do so by enabling the setting for IDS_OPTIONS_SETTINGS_USE_SHARED_PROXIES.">
+  <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PROXY_POLICY" desc="In settings Internet options, banner displayed when the proxy settings are enforced by a policy.">
+    The proxy is enforced by your administrator.
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PROXY_EXTENSION" desc="In settings Internet options, banner displayed when the proxy settings are enforced by an extension.">
+    The proxy is enforced by an extension.
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PROXY_OTHER_PRECEDE" desc="In settings Internet options, banner displayed when the proxy settings cannot be changed as they are enforced by a higher-precedence source.">
+    The proxy cannot be modified by the user.
+  </message>
+  <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PROXY_ENABLE_SHARED_HINT" desc="In settings Internet options, banner displayed when the proxy settings cannot be changed as the user needs to enable the setting for IDS_OPTIONS_SETTINGS_USE_SHARED_PROXIES first.">
     To change proxy, enable "<ph name="USE_SHARED_PROXIES">$1<ex>Allow proxies for shared networks</ex></ph>" setting.
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_HARDWARE_ADDRESS" desc="In settings Internet options, the label hardware address.">
     Hardware address:
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_SECURITY_NONE" desc="In settings Internet options, a string specifying security none.">
     None
   </message>
   <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_SECURITY_WEP" desc="In settings Internet options, a string specifying security WEP.">
     WEP
@@ skipping 2247 matching lines @@
   <message name="IDS_LOGIN_MANAGED_BY_STATUS_NETWORK_ERROR" desc="Text for the network error status in 'Managed by DOMAIN' label on login screen.">
     Network error while communicating with the device management service.
   </message>
   <message name="IDS_LOGIN_MANAGED_BY_NOTICE" desc="Text for the notification bar on the login screen showing that this is a managed device.">
     This device is managed by <ph name="DOMAIN">$1<ex>yourdomain.com</ex></ph>.
   </message>
   <message name="IDS_LOGIN_MANAGED_REPORTING_HINT" desc="Text for the hint on reporting features displayed in the enterprise notification bar on the login screen.">
     Device usage may be tracked.
   </message>
 </grit-part>