GitLab

https://crrev.com/c/2410841 updated x_server_clipboard.cc to use Xproto,
but introduced two errors that broke reading the clipboard in UTF-8
format.

The first error has to do with how 32-bit properties are returned. With
Xlib, such properties are returned as longs regardless of the platform,
meaning they are actually returned as 64-bit values on 64-bit
architectures. Xproto, however, always returns them as 32-bit values.
The clipboard code, however, was still expecting longs. This change
updates the clipboard code to expect 32-bit values as returned by
Xproto.

The second error was a mistranscription when converting
RequestSelectionTargets from XConvertSelection to the equivalent Xproto
call.

Bug: 1149033
Change-Id: Ib3fe97fcbd0b0579a578858796e084901dd8a360
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537977Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827673}