Revert "[Closure GN] Convert MD Bookmarks Closure Compilation to GN"

This reverts commit a77029c40317fa3bd45dfbf387c383b966773db9.

Reason for revert: Build failed because it is missing java during closure compilation step on windows bot: 
https://ci.chromium.org/buildbot/chromium/Win/64904 

Original change's description:
> [Closure GN] Convert MD Bookmarks Closure Compilation to GN
> 
> Bug: 632206
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: I05b1348c408965811a2b557bc2a1cb2ee7850096
> Reviewed-on: https://chromium-review.googlesource.com/954822
> Commit-Queue: calamity <[email protected]>
> Reviewed-by: Demetrios Papadopoulos <[email protected]>
> Reviewed-by: Dirk Pranke <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#542749}

[email protected],[email protected],[email protected]

Change-Id: I9f52c5010125781f35a08d3fa0743362c788706a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 632206
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/960141
Reviewed-by: Christian Dullweber <[email protected]>
Commit-Queue: Christian Dullweber <[email protected]>
Cr-Commit-Position: refs/heads/master@{#542755}
diff --git a/BUILD.gn b/BUILD.gn
index cc52e22..b4699c1d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1154,10 +1154,10 @@
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
-if (!is_win && !is_ios) {
+if (!is_win) {
   group("webui_closure_compile") {
     data_deps = [
-      "chrome/browser/resources:closure_compile",
+      "chrome/browser/resources/engagement:closure_compile",
       "ui/webui/resources:closure_compile",
     ]
   }