[XProto] Fix pasting of large images on servers without BIG-REQUESTS

This corrects a bad refactor from this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2253223

R=sky
BUG=1114385

Change-Id: I0abd00304b3ed220756ea2d27a91697638f7a02b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376879
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802004}

ui/base/clipboard/clipboard_x11.cc

@@ -462,8 +462,6 @@ bool ClipboardX11::X11Details::DispatchXEvent(x11::Event* xev) {
       clipboard_owner_.OnSelectionClear(*xev);
     }
   } else if (auto* prop = xev->As<x11::PropertyNotifyEvent>()) {
-    if (prop->window != x_window_)
-      return false;
     if (primary_owner_.CanDispatchPropertyEvent(*xev))
       primary_owner_.OnPropertyEvent(*xev);
     if (clipboard_owner_.CanDispatchPropertyEvent(*xev))