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

components/policy/core/common/policy_pref_names.cc

Index: components/policy/core/common/policy_pref_names.cc
diff --git a/components/policy/core/common/policy_pref_names.cc b/components/policy/core/common/policy_pref_names.cc
index 4dda07a83efa1fe96e996e73fa5b1013e624bf1e..d788866dd033b81b070c1b408f728466a0c6da74 100644
--- a/components/policy/core/common/policy_pref_names.cc
+++ b/components/policy/core/common/policy_pref_names.cc
@@ -11,6 +11,12 @@ namespace policy_prefs {
 // by UMA_HISTOGRAM_ENUMERATION.
 const char kLastPolicyStatisticsUpdate[] = "policy.last_statistics_update";
 
+// Blocks access to the listed host patterns.
+const char kUrlBlacklist[] = "policy.url_blacklist";
+
+// Allows access to the listed host patterns, as exceptions to the blacklist.
+const char kUrlWhitelist[] = "policy.url_whitelist";
+
 // Integer that specifies the policy refresh rate for user-policy in
 // milliseconds. Not all values are meaningful, so it is clamped to a sane range
 // by the cloud policy subsystem.