Remove flaky ShelfTooltipManagerTest.ShowTooltipWithDelay checks.

ash/shelf/shelf_tooltip_manager_unittest.cc

Index: ash/shelf/shelf_tooltip_manager_unittest.cc
diff --git a/ash/shelf/shelf_tooltip_manager_unittest.cc b/ash/shelf/shelf_tooltip_manager_unittest.cc
index b03eb96c054924b48f638c192559c54adc0e551f..d24fd793e846b662d8ea839176bc431bd28f3fb6 100644
--- a/ash/shelf/shelf_tooltip_manager_unittest.cc
+++ b/ash/shelf/shelf_tooltip_manager_unittest.cc
@@ -60,12 +60,7 @@ TEST_F(ShelfTooltipManagerTest, ShowTooltipWithDelay) {
   tooltip_manager_->ShowTooltipWithDelay(shelf_->GetAppListButton());
   EXPECT_FALSE(tooltip_manager_->IsVisible());
   EXPECT_TRUE(IsTimerRunning());
-  RunAllPendingInMessageLoop();
-#if !defined(OS_WIN)
-  // This check fails on Windows.
-  EXPECT_TRUE(tooltip_manager_->IsVisible());
-#endif  // !OS_WIN
-  EXPECT_FALSE(IsTimerRunning());
+  // TODO: Test that the delayed tooltip is shown, without flaky failures.
 }
 
 TEST_F(ShelfTooltipManagerTest, DoNotShowForInvalidView) {