Deflake DriveFileSystemExtensionApiTest.FileWatch.

Fake DriveFS uses a native filesystem so file watch events are expected
to be the same for Drive and local filesystems now.

Bug: 891197
Change-Id: Ic14a70c32adc718137f45682457b1944a6a5f2c0
Reviewed-on: https://chromium-review.googlesource.com/c/1292662Reviewed-by: Sergei Datsenko <dats@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601476}

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

@@ -429,10 +429,8 @@ initTests(function(testParams, errorMessage) {
       var testEventListener = new TestEventListener();
        testEventListener.addExpectedEvent(testParams.entries.dir,
                                           'changed', 'deleted');
-      if (!testParams.isOnDrive) {
-        testEventListener.addExpectedEvent(testParams.entries.file,
-                                           'changed', 'deleted');
-      }
+       testEventListener.addExpectedEvent(
+           testParams.entries.file, 'changed', 'deleted');
       testEventListener.start();
 
       testParams.fileSystem.root.getFile(
@@ -475,10 +473,8 @@ initTests(function(testParams, errorMessage) {
     // there will be no event for the deleted directory.
     function onDeleteWatchedDir() {
       var testEventListener = new TestEventListener();
-      if (!testParams.isOnDrive) {
-        testEventListener.addExpectedEvent(testParams.entries.subdir,
-                                           'changed', 'deleted');
-      }
+      testEventListener.addExpectedEvent(
+          testParams.entries.subdir, 'changed', 'deleted');
       testEventListener.addExpectedEvent(testParams.entries.dir,
                                          'changed', 'deleted');
       testEventListener.start();