Content Settings: Add RevocationObserver to measure when permissions are revoked

chrome/browser/content_settings/content_settings_mock_observer.cc

Index: chrome/browser/content_settings/content_settings_mock_observer.cc
diff --git a/chrome/browser/content_settings/content_settings_mock_observer.cc b/chrome/browser/content_settings/content_settings_mock_observer.cc
index 8d898c470f6d6775da1b572db46e0e3b984c16fb..2d89d71a916c2f4ef483259ca34281e32210581b 100644
--- a/chrome/browser/content_settings/content_settings_mock_observer.cc
+++ b/chrome/browser/content_settings/content_settings_mock_observer.cc
@@ -9,7 +9,20 @@ namespace content_settings {
 MockObserver::MockObserver() {
 }
 
-MockObserver::~MockObserver()  {
+MockObserver::~MockObserver() {
+}
+
+MockRevocationObserver::MockRevocationObserver() {
+}
+
+MockRevocationObserver::~MockRevocationObserver() {
+}
+
+void MockRevocationObserver::OnContentSettingChanged(
+    const ContentSettingsPattern& primary_pattern,
+    const ContentSettingsPattern& secondary_pattern,
+    ContentSettingsType content_type,
+    std::string resource_identifier) {
 }
 
 }  // namespace content_settings