WebContentsVideoCapture Cleanup: Gut-out dead code, and tighten BUILDs.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index ca7f97f12c2d72c2a2ba3b1421b4b0caaab521c0..5d8e3cab70e583a6d9427114cfe4b4ba68e383b1 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -1127,9 +1127,7 @@ test("content_unittests") {
     "../browser/media/audible_metrics_unittest.cc",
     "../browser/media/audio_stream_monitor_unittest.cc",
     "../browser/media/capture/audio_mirroring_manager_unittest.cc",
-    "../browser/media/capture/cursor_renderer_aura_unittest.cc",
     "../browser/media/capture/web_contents_audio_input_stream_unittest.cc",
-    "../browser/media/capture/web_contents_video_capture_device_unittest.cc",
     "../browser/media/cdm_registry_impl_unittest.cc",
     "../browser/media/media_internals_unittest.cc",
     "../browser/media/midi_host_unittest.cc",
@@ -1585,11 +1583,6 @@ test("content_unittests") {
       deps += [ "//third_party/webrtc/modules/desktop_capture" ]
     }
 
-    if (is_chromeos) {
-      sources +=
-          [ "../browser/media/capture/desktop_capture_device_aura_unittest.cc" ]
-    }
-
     if (is_chromecast) {
       sources -= [
         "../renderer/media/audio_track_recorder_unittest.cc",
@@ -1606,6 +1599,18 @@ test("content_unittests") {
     ]
   }
 
+  # Screen capture unit tests.
+  if (is_linux || is_mac || is_win) {
+    sources += [ "../browser/media/capture/web_contents_video_capture_device_unittest.cc" ]
+    if (use_aura) {
+      sources += [ "../browser/media/capture/cursor_renderer_aura_unittest.cc" ]
+    }
+    if (is_chromeos) {
+      sources +=
+          [ "../browser/media/capture/desktop_capture_device_aura_unittest.cc" ]
+    }
+  }
+
   if (is_linux) {
     if (use_dbus) {
       deps += [ "//dbus:test_support" ]
@@ -1683,7 +1688,7 @@ test("content_unittests") {
   }
 
   # Avoid windows due to non-availability of cursor resources in test.
-  if (!use_aura || is_win) {
+  if (is_win) {
     sources -= [ "../browser/media/capture/cursor_renderer_aura_unittest.cc" ]
   }
   if (use_aura || toolkit_views) {