sheriff: Disable SoftwareMirrorRotationForNonTablet

TBR=afakhry@chromium.org

Bug: 1003339
Change-Id: I49bdda14651699c562dbfc25be3ce434d570ab54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803945Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696717}

ash/display/display_manager_unittest.cc

@@ -4433,7 +4433,8 @@ TEST_F(DisplayManagerTest, DISABLED_SoftwareMirrorRotationForTablet) {
   EXPECT_EQ(gfx::RectF(0.0f, 100.0f, 800.0f, 600.0f), transformed_rect3);
 }
 
-TEST_F(DisplayManagerTest, SoftwareMirrorRotationForNonTablet) {
+// crbug.com/1003339
+TEST_F(DisplayManagerTest, DISABLED_SoftwareMirrorRotationForNonTablet) {
   MirrorWindowTestApi test_api;
   UpdateDisplay("400x300,800x800");