Revert of Only install extensions into the main world

Revert of Only install extensions into the main world (https://codereview.chromium.org/144073006/)

Reason for revert:
Breaks build

Original issue's description:
> Only install extensions into the main world
> 
> BUG=none
> R=dcarney@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=246322

TBR=dcarney@chromium.org,jochen@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

[eustas, 2014-01-22 15:08:44]

Created Revert of Only install extensions into the main world

[commit-bot: I haz the power, 2014-01-22 15:09:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eustas@chromium.org/145013002/1

[commit-bot: I haz the power, 2014-01-22 15:09:20]

Failed to apply patch for content/renderer/render_view_impl.cc:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file content/renderer/render_view_impl.cc
  Hunk #1 FAILED at 3636.
  1 out of 1 hunk FAILED -- saving rejects to file
content/renderer/render_view_impl.cc.rej

Patch:       content/renderer/render_view_impl.cc
Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc
b/content/renderer/render_view_impl.cc
index
013c2c0c4d380e2db8c6edbb2db736e3682a26cf..0dcfea80f694600754d251b593d0a929482d3345
100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -3636,11 +3636,7 @@
   FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                     DidClearWindowObject(frame, world_id));
 
-  // Only install controllers into the main world.
-  if (!world_id)
-    return;
-
-  if (enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION))
+  if ((enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION) && (world_id == 0))
     DomAutomationController::Install(this, frame);
 
   if (enabled_bindings_ & BINDINGS_POLICY_STATS_COLLECTION)