Enable more tests in GN build.

components/cdm/browser/BUILD.gn

Index: components/cdm/browser/BUILD.gn
diff --git a/components/user_prefs/BUILD.gn b/components/cdm/browser/BUILD.gn
similarity index 53%
copy from components/user_prefs/BUILD.gn
copy to components/cdm/browser/BUILD.gn
index 394c18f91d68611c9dd19f6a4359becddf4c4b61..e18b67035e55756ee7f08d3048949c8f8a7feb7b 100644
--- a/components/user_prefs/BUILD.gn
+++ b/components/cdm/browser/BUILD.gn
@@ -2,19 +2,17 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-component("user_prefs") {
+source_set("browser") {
   sources = [
-    "user_prefs.cc",
-    "user_prefs.h",
-    "user_prefs/user_prefs_export.h",
+    "cdm_message_filter_android.cc",
+    "cdm_message_filter_android.h",
   ]
 
-  defines = [ "USER_PREFS_IMPLEMENTATION" ]
-
   deps = [
     "//base",
-    "//base:prefs",
-    "//base/third_party/dynamic_annotations",
+    "//components/cdm/common",
     "//content/public/browser",
+    "//content/public/common",
+    "//media",
   ]
 }