Disable Delete option for custom wallpapers when 'Surprise Me' is enabled.

chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js

Index: chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js
diff --git a/chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js b/chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js
index b82d5cdce3ca21fa79a2eec14bd6761904ced6db..357dbfeb6e9818e6e6902ecd0a75270f78bd7f6a 100644
--- a/chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js
+++ b/chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js
@@ -202,6 +202,7 @@ function WallpaperManager(dialogDom) {
     var onSuccess = function() {
       if (chrome.runtime.lastError == null) {
         if (shouldEnable) {
+          self.document_.body.removeAttribute('surprise-me-disabled');
           checkbox.classList.add('checked');
           // Hides the wallpaper set by message if there is any.
           $('wallpaper-set-by-message').textContent = '';
@@ -214,6 +215,7 @@ function WallpaperManager(dialogDom) {
                                      self.currentWallpaper_);
           }
           checkbox.classList.remove('checked');
+          self.document_.body.setAttribute('surprise-me-disabled', '');
         }
         $('categories-list').disabled = shouldEnable;
         $('wallpaper-grid').disabled = shouldEnable;
@@ -281,6 +283,7 @@ function WallpaperManager(dialogDom) {
 
     if (this.enableOnlineWallpaper_) {
       var self = this;
+      self.document_.body.setAttribute('surprise-me-disabled', '');
       $('surprise-me').hidden = false;
       $('surprise-me').addEventListener('click',
                                         this.toggleSurpriseMe_.bind(this));
@@ -288,6 +291,7 @@ function WallpaperManager(dialogDom) {
         $('surprise-me').querySelector('#checkbox').classList.add('checked');
         $('categories-list').disabled = true;
         $('wallpaper-grid').disabled = true;
+        self.document_.body.removeAttribute('surprise-me-disabled');
       };
 
       WallpaperUtil.enabledSyncThemesCallback(function(syncEnabled) {