Prettify Mac names, rewrite getDisplayPath API call to focus on $HOME

chrome/test/data/extensions/api_test/file_system/get_display_path_prettify_mac/test.js

Index: chrome/test/data/extensions/api_test/file_system/get_display_path_prettify_mac/test.js
diff --git a/chrome/test/data/extensions/api_test/file_system/get_display_path_prettify/test.js b/chrome/test/data/extensions/api_test/file_system/get_display_path_prettify_mac/test.js
similarity index 65%
copy from chrome/test/data/extensions/api_test/file_system/get_display_path_prettify/test.js
copy to chrome/test/data/extensions/api_test/file_system/get_display_path_prettify_mac/test.js
index 1cf19a154e68debe4c2f29e6f96e0fd173d89421..a0d98cd23e3a8e928762a89ffb9f825a1f5c65d4 100644
--- a/chrome/test/data/extensions/api_test/file_system/get_display_path_prettify/test.js
+++ b/chrome/test/data/extensions/api_test/file_system/get_display_path_prettify_mac/test.js
@@ -7,13 +7,13 @@ chrome.test.runTests([
     chrome.fileSystem.chooseFile(chrome.test.callbackPass(function(entry) {
       chrome.test.assertEq('gold.txt', entry.name);
 
-      // Test that we can get the display path of the file, and that it begins
-      // with the home directory indicator (currently "~").
+      // Test that we can get the display path of the file, and that it does
+      // not begin with a slash. As this test may be run on a wide variety
+      // of machines with different locales, we cannot test the actual prefix.
       chrome.fileSystem.getDisplayPath(entry, chrome.test.callbackPass(
           function(path) {
-        chrome.test.assertTrue(path.indexOf("~/") == 0 ||  // POSIX
-                               path.indexOf("~\\") == 0);  // Windows
-        chrome.test.assertTrue(path.indexOf("gold.txt") >= 0);
+        chrome.test.assertTrue(path.substring(0, 1) != '/');
+        chrome.test.assertTrue(path.indexOf("/gold.txt") >= 0);
       }));
     }));
   }