`chrome.browsingData` extension API can now remove data from protected origins.

chrome/common/extensions/api/browsing_data.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": "browsingData",
     "types": [
       {
         "id": "RemovalOptions",
         "type": "object",
         "description": "Options that determine exactly what data will be removed.",
         "properties": {
           "since": {
             "type": "number",
             "optional": true,
             "description": "Remove data accumulated on or after this date, represented in milliseconds since the epoch (accessible via the <code>getTime</code> method of the JavaScript <code>Date</code> object). If absent, defaults to 0 (which would remove all browsing data)."
+          },
+          "origin_types": {
+            "type": "object",
+            "optional": true,
+            "description": "An object whose properties specify which origin types ought to be cleared. If this object isn't specified, it defaults to clearing only \"unprotected\" origins. Please ensure that you <em>really</em> want to remove application data before adding 'protected_web'.",
+            "properties": {
+              "unprotected_web": {
+                "type": "boolean",
+                "optional": true,
+                "description": "Normal websites."
+              },
+              "protected_web": {
+                "type": "boolean",
+                "optional": true,
+                "description": "Websites that have been installed as hosted applications."
+              }
+            }
           }
         }
       }
     ],
     "functions": [
       {
         "name": "remove",
         "description": "Clears various types of browsing data stored in a user's profile.",
         "type": "function",
         "parameters": [
@@ skipping 294 matching lines @@
             "type": "function",
             "description": "Called when websites' WebSQL databases have been cleared.",
             "optional": true,
             "parameters": []
           }
         ]
       }
     ]
   }
 ]