[Chromecast] Upgrade to new CMA backend API

chromecast/media/cma/adapter/BUILD.gn

+# Copyright 2015 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.
+
+source_set("adapter") {
+  sources = [
+    "audio_pipeline_device.h",
+    "backend_adapter.cc",
+    "backend_adapter.h",
+    "media_clock_device.h",
+    "media_component_device.h",
+    "media_pipeline_device.h",
+    "video_pipeline_device.h",
+  ]
+
+  public_deps = [
+    "//chromecast/public/media",
+  ]
+
+  deps = [
+    "//base",
+  ]
+
+  configs += [ "//chromecast:config" ]
+}