Removes workspace_animations.(h,cc)

ash/wm/window_animations.h

Index: ash/wm/window_animations.h
diff --git a/ash/wm/window_animations.h b/ash/wm/window_animations.h
index d56f2b2f40f1d1ca9f0a898c90de25f50019b117..b0e4a2efec453b461a1d8981e8a5e610088a4ae0 100644
--- a/ash/wm/window_animations.h
+++ b/ash/wm/window_animations.h
@@ -37,6 +37,9 @@ enum LayerScaleAnimationDirection {
   LAYER_SCALE_ANIMATION_BELOW,
 };
 
+// Amount of time for the cross fade animation.
+extern const int kCrossFadeDurationMS;
+
 // Animate a cross-fade of |window| from its current bounds to |new_bounds|.
 ASH_EXPORT void CrossFadeToBounds(aura::Window* window,
                                   const gfx::Rect& new_bounds);