Revert of cancel overlay-scrollbar hover state when moving pointer out of window for ChromeOS

cc/input/scrollbar_animation_controller_thinning_unittest.cc

Index: cc/input/scrollbar_animation_controller_thinning_unittest.cc
diff --git a/cc/input/scrollbar_animation_controller_thinning_unittest.cc b/cc/input/scrollbar_animation_controller_thinning_unittest.cc
index 64096b7eae0e9581e152ef81d1602125be795b59..4824879f67af4f5436a0429e4bdf336051a84d3c 100644
--- a/cc/input/scrollbar_animation_controller_thinning_unittest.cc
+++ b/cc/input/scrollbar_animation_controller_thinning_unittest.cc
@@ -518,40 +518,5 @@
   }
 }
 
-// Move mouse on scrollbar and capture then move out of window. Confirm that
-// the bar stays thick and dark.
-TEST_F(ScrollbarAnimationControllerThinningTest,
-       MouseCapturedAndExitWindowFromScrollbar) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Move in
-  scrollbar_controller_->DidMouseMoveNear(0);
-
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(kDuration);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Capture
-  scrollbar_controller_->DidCaptureScrollbarBegin();
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // move out of window
-  scrollbar_controller_->DidMouseMoveOffScrollbar();
-
-  // test for 10 seconds, stay thick and dark
-  for (int i = 0; i < 10; ++i) {
-    time += base::TimeDelta::FromSeconds(1);
-    scrollbar_controller_->Animate(time);
-    EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-    EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-  }
-}
-
 }  // namespace
 }  // namespace cc