Flash: Remove remaining third_party/adobe files.

Bug: 1064651
Change-Id: I9f30559a14a170652910bdbf12505c49f5c3591f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617579
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842045}

third_party/adobe/DIR_METADATA

-monorail {
-  component: "Internals>Plugins>Flash"
-}

third_party/adobe/OWNERS

-cpu@chromium.org
-jschuh@chromium.org
-raymes@chromium.org
-viettrungluu@chromium.org

third_party/adobe/README.chromium

-Name: Adobe Flash
-URL: http://www.adobe.com/products/flashplayer.html
-Version: Varies
-Included In Release: Yes
-Security Critical: Yes
-License: Commercial
-
-Description:
-
-This directory is a glue layer providing targets to allow Chromium to
-build without the Adobe Flash build results necessary to build
-branded Google Chrome.

third_party/adobe/flash/flapper_version.h

-// This is a stand-in for a generated file that is available when Flapper is
-// available.
-
-#ifndef FLAPPER_VERSION_H_INCLUDED_
-#define FLAPPER_VERSION_H_INCLUDED_
-
-// If Flapper were available, we'd define two things:
-//  - FLAPPER_AVAILABLE (to indicate availability), and
-//  - FLAPPER_VERSION_STRING (with the version of the Flapper that's available
-//    as a string, e.g., "11.2.123.456").
-
-#endif  // FLAPPER_VERSION_H_INCLUDED_