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When use_x11 && use_ozone are set to true at the same
time, the compiler throws an error about multiple definitions
of the Create() method for Clipboard.

Thus, to fix that, create a separate source file for
is_linux case that will choose what Clipboard impl to
use based on the IsUsingOzonePlatform feature flag.

Please note that this is a temp solution and it will
be removed once use_x11 goes away.

Please note that it's impossible to build use_x11 && use_ozone without
some hacks in PlatformCursor code. The changes to that are on their
way to upstream.

Bug: 1085700
Change-Id: I3a32b261ec01fd2a751127b5abda1147575b8e18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247760
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779210}