MD History: update (instead of re-create) data sources on sign in change

content/browser/webui/url_data_source_impl.cc

 // Copyright (c) 2012 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 "content/browser/webui/url_data_source_impl.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
 #include "content/browser/webui/url_data_manager_backend.h"
@@ skipping 27 matching lines @@
     // count). This means it's entirely possible for the DataSource to invoke
     // |SendResponse| between the time when there are no more refs and the time
     // when the object is deleted.
     return;
   }
   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                           base::Bind(&URLDataSourceImpl::SendResponseOnIOThread,
                                      this, request_id, std::move(bytes)));
 }
 
+bool URLDataSourceImpl::IsWebUIDataSourceImpl() const {
+  return false;
+}
+
 void URLDataSourceImpl::SendResponseOnIOThread(
     int request_id,
     scoped_refptr<base::RefCountedMemory> bytes) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (backend_)
     backend_->DataAvailable(request_id, bytes.get());
 }
 
 }  // namespace content