Make the hcsm and its providers communicate via an observer interface.

chrome/browser/content_settings/content_settings_policy_provider_unittest.cc

Index: chrome/browser/content_settings/content_settings_policy_provider_unittest.cc
diff --git a/chrome/browser/content_settings/content_settings_policy_provider_unittest.cc b/chrome/browser/content_settings/content_settings_policy_provider_unittest.cc
index 36f321f81dfefa7e078a4605e9824a34835cd59d..1379d6a0dac2b081ccb8bc92c1e6105259541ddc 100644
--- a/chrome/browser/content_settings/content_settings_policy_provider_unittest.cc
+++ b/chrome/browser/content_settings/content_settings_policy_provider_unittest.cc
@@ -6,6 +6,7 @@
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
+#include "chrome/browser/content_settings/content_settings_mock_observer.h"
 #include "chrome/browser/content_settings/mock_settings_observer.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
@@ -109,7 +110,9 @@ TEST_F(PolicyProviderTest, Default) {
   prefs->SetManagedPref(prefs::kManagedImagesBlockedForUrls,
                         value);
 
-  PolicyProvider provider(profile.GetHostContentSettingsMap(), prefs, NULL);
+
+  content_settings::MockObserver mock_observer;
+  PolicyProvider provider(&mock_observer, prefs, NULL);
 
   ContentSettingsPattern yt_url_pattern =
       ContentSettingsPattern::FromString("www.youtube.com");
@@ -149,7 +152,8 @@ TEST_F(PolicyProviderTest, ResourceIdentifier) {
   prefs->SetManagedPref(prefs::kManagedPluginsAllowedForUrls,
                         value);
 
-  PolicyProvider provider(profile.GetHostContentSettingsMap(), prefs, NULL);
+  content_settings::MockObserver mock_observer;
+  PolicyProvider provider(&mock_observer, prefs, NULL);
 
   GURL youtube_url("http://www.youtube.com");
   GURL google_url("http://mail.google.com");