Re-enable QuickView.FileManagerBrowserTest.Test/*

Fixed on issue 831074 issue 804413 issue 829310.

Tbr: yamaguchi-san
Bug: 836254
Change-Id: I71fc9416f0459810ed64d2d96dc033e52087d93f
Reviewed-on: https://chromium-review.googlesource.com/1025453Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553155}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -179,10 +179,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       "deleteMenuItemIsDisabledWhenNoItemIsSelected"),
         TestParameter(NOT_IN_GUEST_MODE, "deleteOneItemFromToolbar")));
 
-// TODO(yamaguchi):Enable after removing root cause of the test flakiness.
-// http://crbug.com/804413.
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    DISABLED_QuickView,
+    QuickView,
     FileManagerBrowserTest,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE, "openQuickView"),
                       TestParameter(NOT_IN_GUEST_MODE, "closeQuickView")));