Refactored the URLBlacklistManager to avoid chrome/ and content/ dependencies.

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index fbc3f7c0993c18d8d6f977b23e5b26ec12eb8e82..b51099dc39a2e6c69812d89df4f2e59f2377c7bb 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -85,6 +85,7 @@
 #include "components/policy/core/common/external_data_fetcher.h"
 #include "components/policy/core/common/mock_configuration_policy_provider.h"
 #include "components/policy/core/common/policy_map.h"
+#include "components/policy/core/common/policy_pref_names.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/policy/core/common/policy_service_impl.h"
 #include "content/public/browser/browser_child_process_host_iterator.h"
@@ -1999,7 +2000,7 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, FileURLBlacklist) {
   FlushBlacklistPolicy();
 
   PrefService* prefs = browser()->profile()->GetPrefs();
-  const base::ListValue* list_url = prefs->GetList(prefs::kUrlBlacklist);
+  const base::ListValue* list_url = prefs->GetList(policy_prefs::kUrlBlacklist);
   EXPECT_EQ(list_url->Find(base::StringValue("file://*")),
             list_url->end());
 
@@ -2010,7 +2011,7 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, FileURLBlacklist) {
   UpdateProviderPolicy(policies);
   FlushBlacklistPolicy();
 
-  list_url = prefs->GetList(prefs::kUrlBlacklist);
+  list_url = prefs->GetList(policy_prefs::kUrlBlacklist);
   EXPECT_NE(list_url->Find(base::StringValue("file://*")),
             list_url->end());