[Mac/GN] Set up the component build.

media/gpu/BUILD.gn

Index: media/gpu/BUILD.gn
diff --git a/media/gpu/BUILD.gn b/media/gpu/BUILD.gn
index 0b9a9be4a227a83737f16d185ca05721aae4779d..09f394371349fd0050ff9f5c0c9cfbfe7091d838 100644
--- a/media/gpu/BUILD.gn
+++ b/media/gpu/BUILD.gn
@@ -185,14 +185,10 @@ component("gpu") {
                  "vt_video_encode_accelerator_mac.h",
                ] + get_target_outputs(":libvt_generate_stubs")
     deps += [ ":libvt_generate_stubs" ]
-    lib_dirs = [ "$mac_sdk_path/usr/lib" ]
-    libs = [
-      "AVFoundation.framework",
-      "CoreMedia.framework",
-      "CoreVideo.framework",
-      "IOSurface.framework",
+    libs += [
+      "CoreFoundation.framework",
+      "Foundation.framework",
       "QuartzCore.framework",
-      "sandbox",
     ]
   }