Modify LoginWebDialogTest.CloseDialogByAccelerator to not depend on ash.

Bug: none
Change-Id: If04229d0caf53848f6dde4f0f7aabde053954f67
Reviewed-on: https://chromium-review.googlesource.com/1008526Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551518}

chrome/browser/chromeos/login/ui/login_web_dialog_browsertest.cc

@@ -4,7 +4,6 @@
 
 #include "chrome/browser/chromeos/login/ui/login_web_dialog.h"
 
-#include "ash/shell.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ -38,7 +37,7 @@ IN_PROC_BROWSER_TEST_F(LoginWebDialogTest, CloseDialogByAccelerator) {
   ASSERT_TRUE(window);
   views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
   views::test::WidgetClosingObserver closing_observer(widget);
-  ui::test::EventGenerator generator(ash::Shell::GetPrimaryRootWindow());
+  ui::test::EventGenerator generator(window);
   generator.PressKey(ui::VKEY_BROWSER_BACK, ui::EF_SHIFT_DOWN);
   closing_observer.Wait();
   EXPECT_TRUE(closing_observer.widget_closed());

testing/buildbot/filters/mash.browser_tests.filter

@@ -36,9 +36,6 @@
 -AutomationApiTestWithDeviceScaleFactor.*
 -AutomationManagerAuraBrowserTest.*
 
-# Uses Shell::GetPrimaryRootWindow to create an EventGenerator
--LoginWebDialogTest.CloseDialogByAccelerator
-
 # Direct access to ash window frames, tablet mode, overview mode, etc.
 -BrowserNonClientFrameViewAshBackButtonTest.*
 -BrowserNonClientFrameViewAshTest.*