Revert of Always create top controls manager

cc/input/top_controls_manager.cc

Index: cc/input/top_controls_manager.cc
diff --git a/cc/input/top_controls_manager.cc b/cc/input/top_controls_manager.cc
index c8bd5348721ca72c007c38ada13b9dd650b536f8..7362805de99acba4c5caa3145f9f268df1778336 100644
--- a/cc/input/top_controls_manager.cc
+++ b/cc/input/top_controls_manager.cc
@@ -101,9 +101,6 @@
 
 gfx::Vector2dF TopControlsManager::ScrollBy(
     const gfx::Vector2dF& pending_delta) {
-  if (!TopControlsHeight())
-    return pending_delta;
-
   if (pinch_gesture_active_)
     return pending_delta;
 
@@ -182,12 +179,6 @@
 
   if (top_controls_animation_ && animation_direction_ == direction)
     return;
-
-  if (!TopControlsHeight()) {
-    client_->SetCurrentTopControlsShownRatio(
-        direction == HIDING_CONTROLS ? 0.f : 1.f);
-    return;
-  }
 
   top_controls_animation_ = KeyframedFloatAnimationCurve::Create();
   base::TimeDelta start_time = gfx::FrameTime::Now() - base::TimeTicks();