Add ContentSettingsProvider Interface.

chrome/browser/content_settings/policy_content_settings_provider.cc

Index: chrome/browser/content_settings/policy_content_settings_provider.cc
diff --git a/chrome/browser/content_settings/policy_content_settings_provider.cc b/chrome/browser/content_settings/policy_content_settings_provider.cc
index d271e74658f46a1ac6d9b659cdbcbf67b9fba6ee..efa2cfcaa79da094c851046f183268f625130e2e 100644
--- a/chrome/browser/content_settings/policy_content_settings_provider.cc
+++ b/chrome/browser/content_settings/policy_content_settings_provider.cc
@@ -38,6 +38,8 @@ const char* kPrefToManageType[CONTENT_SETTINGS_NUM_TYPES] = {
 
 }  // namespace
 
+namespace content_settings {
+
 PolicyContentSettingsProvider::PolicyContentSettingsProvider(Profile* profile)
     : profile_(profile),
       is_off_the_record_(profile_->IsOffTheRecord()) {
@@ -203,3 +205,5 @@ void PolicyContentSettingsProvider::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterIntegerPref(prefs::kManagedDefaultPopupsSetting,
       CONTENT_SETTING_DEFAULT);
 }
+
+}  // content_settings