Fix KDE Wallet backward compatibility when (de)serializing FormData.

components/autofill/core/common/form_data.cc

Index: components/autofill/core/common/form_data.cc
diff --git a/components/autofill/core/common/form_data.cc b/components/autofill/core/common/form_data.cc
index 83d8173ace00f9c67b7a8689f826fc1e13a05cff..b720ae402ea4b72b049c1ce48df529dabc1c7a2a 100644
--- a/components/autofill/core/common/form_data.cc
+++ b/components/autofill/core/common/form_data.cc
@@ -13,7 +13,7 @@ namespace autofill {
 
 namespace {
 
-const int kPickleVersion = 1;
+const int kPickleVersion = 2;
 
 bool ReadGURL(PickleIterator* iter, GURL* url) {
   std::string spec;
@@ -48,6 +48,11 @@ bool DeserializeFormFieldDataVector(PickleIterator* iter,
   return true;
 }
 
+void LogDeserializationError(int version) {
+  DVLOG(1) << "Could not deserialize version " << version
+             << " FormData from pickle.";
+}
+
 }  // namespace
 
 FormData::FormData()
@@ -113,24 +118,36 @@ void SerializeFormData(const FormData& form_data, Pickle* pickle) {
 bool DeserializeFormData(PickleIterator* iter, FormData* form_data) {
   int version;
   if (!iter->ReadInt(&version)) {
-    LOG(ERROR) << "Bad pickle of FormData, no version present";
+    DVLOG(1) << "Bad pickle of FormData, no version present";
     return false;
   }
 
   switch (version) {
     case 1: {
+      base::string16 method;
       if (!iter->ReadString16(&form_data->name) ||
+          !iter->ReadString16(&method) ||
           !ReadGURL(iter, &form_data->origin) ||
           !ReadGURL(iter, &form_data->action) ||
           !iter->ReadBool(&form_data->user_submitted) ||
           !DeserializeFormFieldDataVector(iter, &form_data->fields)) {
-        LOG(ERROR) << "Could not deserialize FormData from pickle";
+        LogDeserializationError(version);
         return false;
       }
       break;
     }
+    case 2:
+      if (!iter->ReadString16(&form_data->name) ||
+          !ReadGURL(iter, &form_data->origin) ||
+          !ReadGURL(iter, &form_data->action) ||
+          !iter->ReadBool(&form_data->user_submitted) ||
+          !DeserializeFormFieldDataVector(iter, &form_data->fields)) {
+        LogDeserializationError(version);
+        return false;
+      }
+      break;
     default: {
-      LOG(ERROR) << "Unknown FormData pickle version " << version;
+      DVLOG(1) << "Unknown FormData pickle version " << version;
       return false;
     }
   }