mash: Migrate some misc ShelfLayoutManager deps to ash common.

ash/wm/window_animations.cc

Index: ash/wm/window_animations.cc
diff --git a/ash/wm/window_animations.cc b/ash/wm/window_animations.cc
index 77024956054399758947f800a641cae8fdf10309..b26f2283b71506eb8619a42c83ebfa77aecf82d0 100644
--- a/ash/wm/window_animations.cc
+++ b/ash/wm/window_animations.cc
@@ -78,12 +78,12 @@ base::TimeDelta GetCrossFadeDuration(aura::Window* window,
   int max_area = std::max(old_area, new_area);
   // Avoid divide by zero.
   if (max_area == 0)
-    return base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS);
+    return base::TimeDelta::FromMilliseconds(wm::kCrossFadeDurationMS);
 
   int delta_area = std::abs(old_area - new_area);
   // If the area didn't change, the animation is instantaneous.
   if (delta_area == 0)
-    return base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS);
+    return base::TimeDelta::FromMilliseconds(wm::kCrossFadeDurationMS);
 
   float factor = static_cast<float>(delta_area) / static_cast<float>(max_area);
   const float kRange = kCrossFadeDurationMaxMs - kCrossFadeDurationMinMs;
@@ -93,8 +93,6 @@ base::TimeDelta GetCrossFadeDuration(aura::Window* window,
 
 }  // namespace
 
-const int kCrossFadeDurationMS = 200;
-
 void AddLayerAnimationsForMinimize(aura::Window* window, bool show) {
   // Recalculate the transform at restore time since the launcher item may have
   // moved while the window was minimized.