Added missing names in extension api jsons

chrome/common/extensions/api/fileBrowserPrivate.json

 [
   {
     "namespace":"fileBrowserPrivate",
     "nodoc": "true",
     "types": [
       {
         "id": "FileBrowserTask",
         "type": "object",
         "description": "Represents information about available browser tasks. A task is an abstraction of an operation that the file browser can perform over a selected file set.",
         "properties": {
@@ skipping 266 matching lines @@
       {
         "name": "getStrings",
         "type": "function",
         "description": "Gets Strings.",
         "parameters": [
           {
             "type": "function",
              "name": "callback",
              "parameters": [
               {
+                "name": "result",
                 "type": "object",
                 "properties": {},
                 "additionalProperties": {"type": "string"}
               }
             ]
           }
         ]
       },
       {
         "name": "addFileWatch",
@@ skipping 61 matching lines @@
             ]
           }
         ]
       },
       {
         "name": "selectFiles",
         "type": "function",
         "description": "Selects multiple files.",
         "parameters": [
           {
+            "name": "selectedPaths",
             "type": "array",
             "description": "Array of selected paths",
             "items": {"type": "string"}
           }
         ]
       },
       {
         "name": "selectFile",
         "type": "function",
         "description": "Selects a file.",
         "parameters": [
           {
+            "name": "selectedPath",
             "type": "string",
             "description": "A selected path"
           },
           {
+            "name": "index",
             "type": "integer",
             "description": "Index of Filter"
           }
         ]
       },
       {
         "name": "viewFiles",
         "type": "function",
         "description": "Views multiple files.",
         "parameters": [
@@ skipping 167 matching lines @@
           {
             "$ref": "FileWatchEvent",
             "name": "event",
             "description": "File watch event information."
           }
         ]
       }
     ]
   }
 ]