Extension Docs Server Version 2: Various fixes.

chrome/common/extensions/api/page_capture.json

 // 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.
 
 [
   {
     "namespace": "pageCapture",
     "functions": [
       {
         "name": "saveAsMHTML",
@@ skipping 11 matching lines @@
               }
             }
           },
           {
             "name": "callback",
             "type": "function",
             "description": "Called when the MHTML has been generated.",
             "parameters": [
               {
                 "name": "mhtmlData",
-                "type": "blob",
+                "type": "binary",
                 "optional": "true",
                 "description": "The MHTML data as a Blob."
               }
             ]
           }
         ]
       }
     ]
   }
 ]