Delete the temporary file when generating MHTML with the extension API.

content/renderer/mhtml_generator.cc

 // Copyright (c) 2011 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/renderer/mhtml_generator.h"
 
 #include "base/platform_file.h"
 #include "content/common/view_messages.h"
 #include "content/renderer/render_view_impl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCString.h"
@@ skipping 16 matching lines @@
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void MHTMLGenerator::OnSavePageAsMHTML(
     int job_id, IPC::PlatformFileForTransit file_for_transit) {
   base::PlatformFile file =
       IPC::PlatformFileForTransitToPlatformFile(file_for_transit);
   file_ = file;
   int64 size = GenerateMHTML();
+  base::ClosePlatformFile(file);
   NotifyBrowser(job_id, size);
 }
 
 void MHTMLGenerator::NotifyBrowser(int job_id, int64 data_size) {
   render_view()->Send(new ViewHostMsg_SavedPageAsMHTML(job_id, data_size));
   file_ = base::kInvalidPlatformFileValue;
 }
 
 // TODO(jcivelli): write the chunks in deferred tasks to give a chance to the
 //                 message loop to process other events.
 int64 MHTMLGenerator::GenerateMHTML() {
   WebKit::WebCString mhtml =
       WebKit::WebPageSerializer::serializeToMHTML(render_view()->GetWebView());
   const size_t chunk_size = 1024;
   const char* data = mhtml.data();
   size_t total_bytes_written = 0;
   while (total_bytes_written < mhtml.length()) {
     size_t copy_size =
         std::min(mhtml.length() - total_bytes_written, chunk_size);
     int bytes_written = base::WritePlatformFile(file_, total_bytes_written,
                                                 data + total_bytes_written,
                                                 copy_size);
     if (bytes_written == -1)
       return -1;
     total_bytes_written += bytes_written;
   }
   return total_bytes_written;
 }