Change the first parameter of savePage.saveAsMHTML to be a dictionary.

chrome/browser/extensions/extension_save_page_api.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 "chrome/browser/extensions/extension_save_page_api.h"
 
 #include "base/file_util.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
@@ skipping 15 matching lines @@
 const char* const kTemporaryFileError = "Failed to create a temporary file.";
 const char* const kTabClosedError = "Cannot find the tab for thie request.";
 
 SavePageAsMHTMLFunction::SavePageAsMHTMLFunction() : tab_id_(0) {
 }
 
 SavePageAsMHTMLFunction::~SavePageAsMHTMLFunction() {
 }
 
 bool SavePageAsMHTMLFunction::RunImpl() {
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &tab_id_));
+  DictionaryValue* args;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &args));
+
+  if (!args->HasKey("tabId"))
+    return false;
+
+  EXTENSION_FUNCTION_VALIDATE(args->GetInteger("tabId", &tab_id_));
 
   AddRef();  // Balanced in ReturnFailure/ReturnSuccess()
 
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &SavePageAsMHTMLFunction::CreateTemporaryFile));
   return true;
 }
 
 void SavePageAsMHTMLFunction::CreateTemporaryFile() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
@@ skipping 83 matching lines @@
 
   DictionaryValue* dict = new DictionaryValue();
   result_.reset(dict);
   dict->SetString("mhtmlFilePath", mhtml_path_.value());
   dict->SetInteger("mhtmlFileLength", file_size);
 
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }