media: Set stricter visibility for //media/base

media/base/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
@@ skipping 10 matching lines @@
     "//media:media_implementation",
   ]
 }
 
 if (is_component_build) {
   link_target_type = "source_set"
 } else {
   link_target_type = "static_library"
 }
 target(link_target_type, "base") {
-  # This is part of the media component.
-  visibility = [ "//media/*" ]
+  # This should only be depended on by "media" target. Other targets should
+  # depend on "media" target directly.
+  visibility = [
+    "//media",
+
+    # TODO(xhwang): Clean up the dependency graph within "media" target.
+    "//media/audio",
+    "//media/ffmpeg",
+
+    # TODO(xhwang): Remove this dependency.
+    "//media/capture",
+  ]
   sources = [
     "audio_block_fifo.cc",
     "audio_block_fifo.h",
     "audio_buffer.cc",
     "audio_buffer.h",
     "audio_buffer_converter.cc",
     "audio_buffer_converter.h",
     "audio_buffer_queue.cc",
     "audio_buffer_queue.h",
     "audio_capturer_source.h",
@@ skipping 563 matching lines @@
 
 fuzzer_test("media_container_names_fuzzer") {
   sources = [
     "container_names_fuzzertest.cc",
   ]
   deps = [
     "//base",
     "//media",
   ]
 }