Add error messages to JSONReader and friends. This required a bit of refactor...

chrome/test/automation/tab_proxy.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/automation/tab_proxy.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "chrome/common/json_value_serializer.h"
@@ skipping 537 matching lines @@
   if (!succeeded) {
     delete response;
     return false;
   }
   // Wrap |json| in an array before deserializing because valid JSON has an
   // array or an object as the root.
   json.insert(0, "[");
   json.append("]");
 
   JSONStringValueSerializer deserializer(json);
-  succeeded = deserializer.Deserialize(value);
+  succeeded = deserializer.Deserialize(value, NULL);
 
   delete response;
   return succeeded;
 }
 
 bool TabProxy::GetConstrainedWindowCount(int* count) const {
   if (!is_valid())
     return false;
 
   if (!count) {
@@ skipping 471 matching lines @@
       &response,
       AutomationMsg_WaitForNavigationResponse::ID);
   scoped_ptr<IPC::Message> auto_deleter(response);
   if (!success)
     return false;
 
   void* iter = NULL;
   response->ReadBool(&iter, &success);
   return success;
 }