Clean up unused constant globals

chrome/browser/ui/gtk/download/download_started_animation_gtk.cc

Index: chrome/browser/ui/gtk/download/download_started_animation_gtk.cc
diff --git a/chrome/browser/ui/gtk/download/download_started_animation_gtk.cc b/chrome/browser/ui/gtk/download/download_started_animation_gtk.cc
index a43e41bf5c1f204806057257010059a144b55939..9cb44a06e4f5be41a8df0e29e0d602ca6dd21a14 100644
--- a/chrome/browser/ui/gtk/download/download_started_animation_gtk.cc
+++ b/chrome/browser/ui/gtk/download/download_started_animation_gtk.cc
@@ -32,11 +32,6 @@ const int kMoveTimeMs = 600;
 // The animation framerate.
 const int kFrameRateHz = 60;
 
-// What fraction of the frame height to move downward from the frame center.
-// Note that setting this greater than 0.5 will mean moving past the bottom of
-// the frame.
-const double kMoveFraction = 1.0 / 3.0;
-
 class DownloadStartedAnimationGtk : public gfx::LinearAnimation,
                                     public content::NotificationObserver {
  public: