[SERVER-18284] Remove Array.isArray polyfill code - MongoDB Jira

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There are two Array.isArray polyfills that I believe can be safely removed or replaced by plain Array.isArray calls:

src/mongo/shell/mongo.js (introduced by ~~SERVER-18198~~):

var isArray = function(maybeArray) {

    return Object.prototype.toString.call(maybeArray) === '[object Array]';

};

src/mongo/shell/types.js:

if (typeof Array.isArray != "function"){

    Array.isArray = function(arr){

        return arr != undefined && arr.constructor == Array

is related to

SERVER-18198 runCommand in the shell should use native runCommand on DBClient