Revert 58802 - Implement the webNavigation.onCommitted event....

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 3174 matching lines @@
         "description": "Fires when a navigation is committed. The document (and the resources it refers to, such as images and subframes) might still be downloading, but at least part of the document has been received from the server and the browser has decided to switch to the new document.",
         "parameters": [
           {
             "type": "object",
             "name": "details",
             "properties": {
               "tabId": {"type": "integer", "description": "The ID of the tab in which the navigation occurs."},
               "url": {"type": "string"},
               "frameId": {"type": "integer", "description": "0 indicates the navigation happens in the tab content window; positive value indicates navigation in a subframe."},
               "transitionType": {"type": "string", "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "start_page", "form_submit", "reload", "keyword", "keyword_generated"], "description": "Cause of the navigation. The same transition types as defined in the history API are used."},
-              "transitionQualifiers": {"type": "string", "description": "Zero or more transition qualifiers delimited by \"|\". Possible qualifiers are \"client_redirect\", \"server_redirect\", and \"forward_back\"."},
+              "transitionQualifiers": {"type": "string", "enum": ["client_redirect", "server_redirect", "forward_back"], "description": "Zero or more transition qualifiers delimited by \"|\". Possible qualifiers are \"client_redirect\", \"server_redirect\", and \"forward_backward\"."},
               "timeStamp": {"type": "number", "description": "The time when the navigation was committed, in milliseconds since the epoch."}
             }
           }
         ]
       },
       {
         "name": "onDOMContentLoaded",
         "type": "function",
         "description": "Fires when the page's DOM is fully constructed, but the referenced resources may not finish loading.",
         "parameters": [
@@ skipping 903 matching lines @@
         "name": "setStoreLogin",
         "description": "Set a preference value with the store login.",
         "parameters": [
           { "name": "login", "type": "string" },
           { "name": "callback", "type": "function", "optional": "true" }
         ]
       }
     ]
   }
 ]