Enforce different min size for popups than tabbed browsers on MacOSX.

chrome/test/data/extensions/api_test/window_update/sizing/test.html

 <script>
 var pass = chrome.test.callbackPass;
 
 var finalTop = 400;
 var finalLeft = 10;
-var finalWidth = 176
-var finalHeight = 201;
+var finalWidth = 476
+var finalHeight = 301;
 
 var chromeWindow = null;
 
 function checkTop(currentWindow) {
   chrome.test.assertEq(finalTop, currentWindow.top);
 }
 
 function checkHeightAndContinue(currentWindow) {
   chrome.test.assertEq(finalHeight, currentWindow.height);
   chrome.windows.update(
@@ skipping 31 matching lines @@
       pass(function(currentWindow) {
         chromeWindow = currentWindow;
         chrome.tabs.create(
           { 'windowId': currentWindow.id, 'url': 'blank.html' },
           pass(updateLeftAndContinue)
         );
     }));
   },
 ]);
 </script>