Revert "FIX: Jobs.cancel_scheduled_job wasn't working anymore due to our move to using multiple queues"

This reverts commit b7c16991f7.

app/jobs/base.rb

@@ -244,10 +244,7 @@ module Jobs
   def self.scheduled_for(job_name, params={})
     params = params.with_indifferent_access
     job_class = "Jobs::#{job_name.to_s.camelcase}"
-
-    scheduled_jobs = []
-    Sidekiq::Queue.all.each do |queue|
-      queue.each do |scheduled_job|
+    Sidekiq::ScheduledSet.new.select do |scheduled_job|
       if scheduled_job.klass.to_s == job_class
         matched = true
         job_params = scheduled_job.item["args"][0].with_indifferent_access
@@ -257,13 +254,12 @@ module Jobs
             break
           end
         end
-          scheduled_jobs << scheduled_job if matched
+        matched
+      else
+        false
       end
     end
   end
-
-    scheduled_jobs
-  end
 end
 
 Dir["#{Rails.root}/app/jobs/onceoff/*.rb"].each {|file| require_dependency file }

app/jobs/scheduled/create_missing_avatars.rb

@@ -7,10 +7,9 @@ module Jobs
       UserAvatar.includes(:user)
                 .where(last_gravatar_download_attempt: nil)
                 .order("users.last_posted_at DESC")
-                .find_in_batches(batch_size: 5000) do |user_avatars|
-        user_avatars.each do |user_avatar|
-          user_avatar.user.refresh_avatar
-        end
+                .limit(5000)
+                .each do |u|
+        u.user.refresh_avatar
       end
     end
   end

app/models/user.rb

@@ -753,7 +753,6 @@ class User < ActiveRecord::Base
     avatar = user_avatar || create_user_avatar
 
     if SiteSetting.automatically_download_gravatars? && !avatar.last_gravatar_download_attempt
-      Jobs.cancel_scheduled_job(:update_gravatar, user_id: self.id, avatar_id: avatar.id)
       Jobs.enqueue(:update_gravatar, user_id: self.id, avatar_id: avatar.id)
     end