[Sync] Add favicon datatype proto support

sync/protocol/proto_value_conversions_unittest.cc

Index: sync/protocol/proto_value_conversions_unittest.cc
diff --git a/sync/protocol/proto_value_conversions_unittest.cc b/sync/protocol/proto_value_conversions_unittest.cc
index 74ae4f27275a7b3da8ee4c6503b1a0577dff8af3..ac5cc2ce1ea9618338b39190b7e184b276603d2f 100644
--- a/sync/protocol/proto_value_conversions_unittest.cc
+++ b/sync/protocol/proto_value_conversions_unittest.cc
@@ -21,6 +21,7 @@
 #include "sync/protocol/experiments_specifics.pb.h"
 #include "sync/protocol/extension_setting_specifics.pb.h"
 #include "sync/protocol/extension_specifics.pb.h"
+#include "sync/protocol/favicon_specifics.pb.h"
 #include "sync/protocol/nigori_specifics.pb.h"
 #include "sync/protocol/password_specifics.pb.h"
 #include "sync/protocol/preference_specifics.pb.h"
@@ -199,6 +200,10 @@ TEST_F(ProtoValueConversionsTest, DictionarySpecificsToValue) {
   TestSpecificsToValue(DictionarySpecificsToValue);
 }
 
+TEST_F(ProtoValueConversionsTest, FaviconSpecificsToValue) {
+  TestSpecificsToValue(FaviconSpecificsToValue);
+}
+
 // TODO(akalin): Figure out how to better test EntitySpecificsToValue.
 
 TEST_F(ProtoValueConversionsTest, EntitySpecificsToValue) {
@@ -218,6 +223,7 @@ TEST_F(ProtoValueConversionsTest, EntitySpecificsToValue) {
   SET_FIELD(experiments);
   SET_FIELD(extension);
   SET_FIELD(extension_setting);
+  SET_FIELD(favicon);
   SET_FIELD(history_delete_directive);
   SET_FIELD(nigori);
   SET_FIELD(password);