[MD History] Disable Clear Browsing Data button for supervised users.

chrome/browser/resources/md_history/history_item.js

Index: chrome/browser/resources/md_history/history_item.js
diff --git a/chrome/browser/resources/md_history/history_item.js b/chrome/browser/resources/md_history/history_item.js
index 4dca56c9957ce8939a64ff63a13b3f89a65c3358..8f53904e3b0abbe4baf956745309294188f6214e 100644
--- a/chrome/browser/resources/md_history/history_item.js
+++ b/chrome/browser/resources/md_history/history_item.js
@@ -111,6 +111,11 @@ cr.define('md_history', function() {
         observer: 'ironListTabIndexChanged_',
       },
 
+      selectionNotAllowed_: {
+        type: Boolean,
+        value: !loadTimeData.getBoolean('allowDeletingHistory'),
+      },
+
       hasTimeGap: Boolean,
 
       index: Number,
@@ -189,7 +194,7 @@ cr.define('md_history', function() {
         }
       }
 
-      if (this.selectionNotAllowed_())
+      if (this.selectionNotAllowed_)
         return;
 
       this.$.checkbox.focus();
@@ -302,10 +307,6 @@ cr.define('md_history', function() {
       this.$.icon.style.backgroundImage = cr.icon.getFavicon(this.item.url);
     },
 
-    selectionNotAllowed_: function() {
-      return !loadTimeData.getBoolean('allowDeletingHistory');
-    },
-
     /**
      * @param {number} numberOfItems The number of items in the card.
      * @param {string} historyDate Date of the current result.