Move CastMessagePortImplTest to //components/cast_streaming

This also removes remaining unused files in //fuchsia/cast_streaming,
removing the directory.

Bug: 1207721
Change-Id: Ib45255d626b2a2893e4992d29c3bcb13927a59b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2895226
Auto-Submit: Fabrice de Gans <fdegans@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Fabrice de Gans <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#884637}

components/cast_streaming/browser/BUILD.gn

@@ -127,7 +127,6 @@ test("e2e_tests") {
     ":test_receiver",
     ":test_sender",
     "//base/test:test_support",
-    "//components/cast/message_port:test_message_port_receiver",
     "//components/openscreen_platform:openscreen_platform_net",
     "//media",
     "//mojo/core/embedder",
@@ -140,12 +139,16 @@ test("e2e_tests") {
   ]
 }
 
-# NOTE: This source set is intentionally empty. It is used to force the building
-# of the code defined in this directory, as it is production code which must
-# be validated as part of the CQ.
-# TODO(crbug.com/1207721): Add unit tests for code in this directory.
+# TODO(crbug.com/1207721): Add more unit tests for code in this directory.
 source_set("unit_tests") {
   testonly = true
-  deps = [ ":browser" ]
-  sources = []
+  deps = [
+    ":browser",
+    ":core",
+    "//base",
+    "//base/test:test_support",
+    "//components/cast/message_port:test_message_port_receiver",
+    "//testing/gtest",
+  ]
+  sources = [ "cast_message_port_impl_unittest.cc" ]
 }

fuchsia/cast_streaming/cast_message_port_impl_unittest.cc → components/cast_streaming/browser/cast_message_port_impl_unittest.cc

@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "fuchsia/cast_streaming/cast_message_port_impl.h"
+#include "components/cast_streaming/browser/cast_message_port_impl.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/run_loop.h"
 #include "base/test/task_environment.h"
 #include "components/cast/message_port/test_message_port_receiver.h"
-#include "fuchsia/cast_streaming/message_serialization.h"
+#include "components/cast_streaming/browser/message_serialization.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cast_streaming {