revert browser newux changes (#5714)

browser/app/js/browser/MainContent.js

@@ -15,27 +15,29 @@
  */
 
 import React from "react"
+import MobileHeader from "./MobileHeader"
 import Header from "./Header"
-import SidebarBackdrop from "./SidebarBackdrop"
 import ObjectsSection from "../objects/ObjectsSection"
 import MainActions from "./MainActions"
 import BucketPolicyModal from "../buckets/BucketPolicyModal"
 import MakeBucketModal from "../buckets/MakeBucketModal"
 import UploadModal from "../uploads/UploadModal"
+import ObjectsBulkActions from "../objects/ObjectsBulkActions"
 import Dropzone from "../uploads/Dropzone"
 
-export const MainContent = ({ sidebarOpen }) => (
-  <section className="content">
-    <Header />
+export const MainContent = () => (
+  <div className="fe-body">
+    <ObjectsBulkActions />
+    <MobileHeader />
     <Dropzone>
+      <Header />
       <ObjectsSection />
     </Dropzone>
     <MainActions />
     <BucketPolicyModal />
     <MakeBucketModal />
     <UploadModal />
-    <SidebarBackdrop />
-  </section>
+  </div>
 )
 
 export default MainContent