[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..1251b3d4b3bc7a10781e701d48eabc461187d131 100644
--- a/sync/protocol/proto_value_conversions_unittest.cc
+++ b/sync/protocol/proto_value_conversions_unittest.cc
@@ -159,6 +159,14 @@ TEST_F(ProtoValueConversionsTest, ExtensionSpecificsToValue) {
   TestSpecificsToValue(ExtensionSpecificsToValue);
 }
 
+TEST_F(ProtoValueConversionsTest, FaviconImageSpecificsToValue) {
+  TestSpecificsToValue(FaviconImageSpecificsToValue);
+}
+
+TEST_F(ProtoValueConversionsTest, FaviconTrackingSpecificsToValue) {
+  TestSpecificsToValue(FaviconTrackingSpecificsToValue);
+}
+
 TEST_F(ProtoValueConversionsTest, HistoryDeleteDirectiveSpecificsToValue) {
   TestSpecificsToValue(HistoryDeleteDirectiveSpecificsToValue);
 }