Add a mimeHandler extension API.

chrome/common/extensions/api/_manifest_features.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.
 
 // This features file defines manifest keys implemented under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
 //
@@ skipping 166 matching lines @@
       "bpmcpldpdmajfigpchkicefoigmkfalc",  // Quickoffice component extension
       "ehibbfinohgbchlgdbfpikodjaojhccn",  // Editor
       "mhjfbmdgcfjbbpaeojofohoefgiehjai"   // PDF
     ]
   },
   "mime_types_handler": {
     "channel": "stable",
     "extension_types": [ "extension", "legacy_packaged_app", "platform_app" ],
     "whitelist": [
       "oickdpebdnfbgkcaoklfcdhjniefkcji",  // browser_tests
-      "gbkeegbaiigmenfmjfclcdgdpimamgkj",  // QuickOffice
-      "ionpfmkccalenbmnddpbmocokhaknphg",  // QuickOffice Dev
-      "bpmcpldpdmajfigpchkicefoigmkfalc",  // Quickoffice component extension
-      "ehibbfinohgbchlgdbfpikodjaojhccn",  // Editor
       "mhjfbmdgcfjbbpaeojofohoefgiehjai"   // PDF
     ]
   },
   "minimum_chrome_version": {
     "channel": "stable",
     "extension_types": [
       "extension", "legacy_packaged_app", "hosted_app", "platform_app"
     ]
   },
   "omnibox": {
@@ skipping 82 matching lines @@
   },
   "update_url": {
     "channel": "stable",
     "extension_types": "all"
   },
   "url_handlers": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }