Remove special case for gpr url

src/installer.ts

@@ -10,7 +10,6 @@ import {chmodSync} from 'fs';
 import * as os from 'os';
 import * as path from 'path';
 import * as semver from 'semver';
-import * as util from 'util';
 
 const IS_WINDOWS = process.platform === 'win32';