Add more components unittests to the GN build.

components/data_reduction_proxy/core/browser/BUILD.gn

Index: components/data_reduction_proxy/core/browser/BUILD.gn
diff --git a/components/data_reduction_proxy/core/browser/BUILD.gn b/components/data_reduction_proxy/core/browser/BUILD.gn
index e3348a9ac6b90c83d28ac71c9c7b5ed76c98dc2b..ed9fb760eaa70ff005529b3ea1de2ea41a0cdd78 100644
--- a/components/data_reduction_proxy/core/browser/BUILD.gn
+++ b/components/data_reduction_proxy/core/browser/BUILD.gn
@@ -31,10 +31,12 @@ static_library("browser") {
 
   deps = [
     "//base",
+    "//base:prefs",
     "//components/data_reduction_proxy/core/common",
     "//components/pref_registry",
     "//crypto",
     "//net",
+    "//url",
   ]
   if (!is_android && !is_ios) {
     deps += [ 
@@ -43,16 +45,19 @@ static_library("browser") {
   }
 }
 
-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",
   ]
 
-  deps = [
+  public_deps = [
     ":browser",
+  ]
+  deps = [
     "//base",
+    "//base:prefs_test_support",
     "//components/data_reduction_proxy/core/common",
     "//components/data_reduction_proxy/core/common:test_support",
     "//net",
@@ -78,6 +83,11 @@ source_set("unit_tests") {
   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",
   ]