Update managed icon in CrOS proxy settings dialog.

This one got left out of the mass icon switch.

BUG=323658

Review URL: https://codereview.chromium.org/125853003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243544 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/theme/theme_resources.grd

@@ -450,7 +450,6 @@
         <structure type="chrome_scaled_image" name="IDR_LOGIN_PASSWORD_CAPS_LOCK" file="login_password_capslock.png" />
       </if>
       <structure type="chrome_scaled_image" name="IDR_LOGIN_GUEST" file="common/login_guest.png" />
-      <structure type="chrome_scaled_image" name="IDR_MANAGED" file="managed_small.png" />
       <if expr="pp_ifdef('chromeos')">
         <structure type="chrome_scaled_image" name="IDR_MANAGED_MODE_ICON" file="cros/managed_mode_icon.png" />
       </if>

chrome/browser/resources/uber/uber_shared.css

@@ -166,7 +166,7 @@ body.uber-frame section > div:only-of-type {
 .page-banner-text {
   -webkit-padding-end: 8px;
   -webkit-padding-start: 26px;
-  background-image: url('chrome://theme/IDR_MANAGED');
+  background-image: url('chrome://theme/IDR_CONTROLLED_SETTING_MANDATORY');
   background-position: 5px center;
   background-repeat: no-repeat;
   background-size: 16px;