[ash-md] Remove the number of animators used for the Shelf animations.

ui/gfx/animation/slide_animation.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/animation/slide_animation.h"
 
 #include <math.h>
 
 namespace gfx {
 
@@ skipping 49 matching lines @@
   // If we're already hiding (or hidden), we have nothing to do.
   if (!showing_)
     return;
 
   showing_ = false;
   value_start_ = value_current_;
   value_end_ = 0.0;
 
   // Make sure we actually have something to do.
   if (slide_duration_ == 0) {
+    // TODO(bruthig): Investigate if this should really be animating to 0.0, I
+    // think it should be animating to 1.0.
     AnimateToState(0.0);  // Skip to the end of the animation.
     return;
   } else if (value_current_ == value_end_) {
     return;
   }
 
   // This will also reset the currently-occurring animation.
   SetDuration(static_cast<int>(slide_duration_ * value_current_));
   Start();
 }
@@ skipping 21 matching lines @@
 
   // Correct for any overshoot (while state may be capped at 1.0, let's not
   // take any rounding error chances.
   if ((value_end_ >= value_start_ && value_current_ > value_end_) ||
       (value_end_ < value_start_ && value_current_ < value_end_)) {
     value_current_ = value_end_;
   }
 }
 
 }  // namespace gfx