Add more components unittests to the GN build.

components/data_reduction_proxy/core/browser/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.
 
 static_library("browser") {
   sources = [
     "data_reduction_proxy_auth_request_handler.cc",
     "data_reduction_proxy_auth_request_handler.h",
     "data_reduction_proxy_config_service.cc",
     "data_reduction_proxy_config_service.h",
@@ skipping 13 matching lines @@
     "data_reduction_proxy_statistics_prefs.cc",
     "data_reduction_proxy_statistics_prefs.h",
     "data_reduction_proxy_tamper_detection.cc",
     "data_reduction_proxy_tamper_detection.h",
     "data_reduction_proxy_usage_stats.cc",
     "data_reduction_proxy_usage_stats.h",
   ]
 
   deps = [
     "//base",
+    "//base:prefs",
     "//components/data_reduction_proxy/core/common",
     "//components/pref_registry",
     "//crypto",
     "//net",
+    "//url",
   ]
   if (!is_android && !is_ios) {
     deps += [ 
       "//google_apis",
     ]
   }
 }
 
-static_library("test_support") {
+source_set("test_support") {
   testonly = true
   sources = [
     "data_reduction_proxy_settings_test_utils.cc",
     "data_reduction_proxy_settings_test_utils.h",
   ]
 
+  public_deps = [
+    ":browser",
+  ]
   deps = [
-    ":browser",
     "//base",
+    "//base:prefs_test_support",
     "//components/data_reduction_proxy/core/common",
     "//components/data_reduction_proxy/core/common:test_support",
     "//net",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "data_reduction_proxy_auth_request_handler_unittest.cc",
     "data_reduction_proxy_config_service_unittest.cc",
     "data_reduction_proxy_interceptor_unittest.cc",
     "data_reduction_proxy_metrics_unittest.cc",
     "data_reduction_proxy_prefs_unittest.cc",
     "data_reduction_proxy_protocol_unittest.cc",
     "data_reduction_proxy_settings_unittest.cc",
     "data_reduction_proxy_usage_stats_unittest.cc",
   ]
 
   deps = [
     ":browser",
     ":test_support",
+    "//base",
+    "//base:prefs_test_support",
+    "//base/test:test_support",
+    "//components/data_reduction_proxy/core/common:test_support",
+    "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }