MD Settings: For some content types, make per-site exceptions read-only.

chrome/browser/resources/settings/privacy_page/privacy_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_vars_css.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../clear_browsing_data_dialog/clear_browsing_data_dialog.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
@@ skipping 225 matching lines @@
       </template>
       <template is="dom-if" route-path="/content/camera" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryCamera}">
           <media-picker type="camera"></media-picker>
           <category-default-setting category="{{ContentSettingsTypes.CAMERA}}"
               toggle-off-label="$i18n{siteSettingsBlocked}"
               toggle-on-label=
                   "$i18n{siteSettingsAskBeforeAccessingRecommended}">
           </category-default-setting>
           <category-setting-exceptions
-              category="{{ContentSettingsTypes.CAMERA}}">
+              category="{{ContentSettingsTypes.CAMERA}}" read-only-list>
           </category-setting-exceptions>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/cookies" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryCookies}">
           <category-default-setting category="{{ContentSettingsTypes.COOKIES}}"
               toggle-off-label="$i18n{siteSettingsBlocked}"
               toggle-on-label="$i18n{siteSettingsCookiesAllowedRecommended}"
               sub-option-label="$i18n{deleteDataPostSession}"
               sub-option-secondary=""><!-- To work with :empty. -->
@@ skipping 23 matching lines @@
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/location" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryLocation}">
           <category-default-setting
               toggle-off-label="$i18n{siteSettingsBlocked}"
               toggle-on-label="$i18n{siteSettingsAskBeforeAccessingRecommended}"
               category="{{ContentSettingsTypes.GEOLOCATION}}">
           </category-default-setting>
           <category-setting-exceptions
-              category="{{ContentSettingsTypes.GEOLOCATION}}">
+              category="{{ContentSettingsTypes.GEOLOCATION}}" read-only-list>
           </category-setting-exceptions>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/handlers" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryHandlers}">
           <protocol-handlers
               toggle-off-label="$i18n{siteSettingsHandlersBlocked}"
               toggle-on-label="$i18n{siteSettingsHandlersAskRecommended}">
           </protocol-handlers>
         </settings-subpage>
@@ skipping 21 matching lines @@
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/microphone" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryMicrophone}">
           <media-picker type="mic"></media-picker>
           <category-default-setting category="{{ContentSettingsTypes.MIC}}"
               toggle-off-label="$i18n{siteSettingsBlocked}"
               toggle-on-label=
                   "$i18n{siteSettingsAskBeforeAccessingRecommended}">
           </category-default-setting>
-          <category-setting-exceptions category="{{ContentSettingsTypes.MIC}}">
+          <category-setting-exceptions
+              category="{{ContentSettingsTypes.MIC}}" read-only-list>
           </category-setting-exceptions>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/notifications" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryNotifications}">
           <category-default-setting
               toggle-off-label="$i18n{siteSettingsBlocked}"
               toggle-on-label="$i18n{siteSettingsAskBeforeSendingRecommended}"
               category="{{ContentSettingsTypes.NOTIFICATIONS}}">
           </category-default-setting>
@@ skipping 49 matching lines @@
       </template>
       <template is="dom-if" route-path="/content/midiDevices" no-search>
         <settings-subpage page-title="$i18n{siteSettingsMidiDevices}">
           <category-default-setting
               toggle-off-label="$i18n{siteSettingsMidiDevicesBlock}"
               toggle-on-label=
                   "$i18n{siteSettingsMidiDevicesAskRecommended}"
               category="{{ContentSettingsTypes.MIDI_DEVICES}}">
           </category-default-setting>
           <category-setting-exceptions
-              category="{{ContentSettingsTypes.MIDI_DEVICES}}">
+              category="{{ContentSettingsTypes.MIDI_DEVICES}}" read-only-list>
           </category-setting-exceptions>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/usbDevices" no-search>
         <settings-subpage page-title="$i18n{siteSettingsUsbDevices}">
           <usb-devices></usb-devices>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/siteDetails" no-search>
         <settings-subpage page-title="$i18n{siteSettingsSiteDetails}">
@@ skipping 40 matching lines @@
                 category="{{ContentSettingsTypes.PROTECTED_CONTENT}}">
             </category-setting-exceptions>
           </template>
 </if>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>