Remove unused imports in tools/bin

tools/bin/gen_defaults.js

@@ -17,7 +17,6 @@
 
 'use strict';
 
-var fs = require('fs');
 var path = require('path');
 var yaml = require('js-yaml');
 

tools/bin/gen_pages_dict.js

@@ -20,9 +20,7 @@
 var fs = require('fs');
 var path = require('path');
 var yaml = require('js-yaml');
-var walk = require('walk');
 var glob = require('glob');
-var Q = require('q');
 var optimist = require('optimist');
 
 var util = require('./util');

tools/bin/gen_versions.js

@@ -17,7 +17,6 @@
 
 'use strict';
 
-var fs = require('fs');
 var path = require('path');
 var yaml = require('js-yaml');
 

tools/bin/toc.js

@@ -19,10 +19,7 @@
 
 var fs = require('fs');
 var path = require('path');
-var childProcess = require('child_process');
 
-var yaml = require('js-yaml');
-var Q = require('q');
 var argv = require('optimist').argv;
 
 var augment = require('./augment_toc');