Return Drive mount point by getMountPoints.

chrome/test/data/extensions/api_test/file_browser/mount_test/test.js

Index: chrome/test/data/extensions/api_test/file_browser/mount_test/test.js
diff --git a/chrome/test/data/extensions/api_test/file_browser/mount_test/test.js b/chrome/test/data/extensions/api_test/file_browser/mount_test/test.js
index c3ca27deb3da744b22b54bcdb4e2b2017e412619..633df0c5145a4ad2225455f5b7cf1f92003d66b9 100644
--- a/chrome/test/data/extensions/api_test/file_browser/mount_test/test.js
+++ b/chrome/test/data/extensions/api_test/file_browser/mount_test/test.js
@@ -58,6 +58,12 @@ var expectedDownloadsVolume = {
 //       and values sorted by mountPath.
 var expectedMountPoints = [
   {
+    sourcePath: '/special/drive',
+    mountPath: 'drive',
+    volumeType: 'drive',
+    mountCondition: ''
+  },
+  {
     mountPath: 'Downloads',
     volumeType: 'downloads',
     mountCondition: ''