Converts Widget::SetOpacity from char to float

chrome/browser/ui/views/download/download_started_animation_views.cc

Index: chrome/browser/ui/views/download/download_started_animation_views.cc
diff --git a/chrome/browser/ui/views/download/download_started_animation_views.cc b/chrome/browser/ui/views/download/download_started_animation_views.cc
index 20bd3cd18149355b27181e2637814e3a273581cb..458d91f90de1f27bbd2c1d36c2dd932d2f65c009 100644
--- a/chrome/browser/ui/views/download/download_started_animation_views.cc
+++ b/chrome/browser/ui/views/download/download_started_animation_views.cc
@@ -113,10 +113,8 @@ void DownloadStartedAnimationViews::AnimateToState(double state) {
     Reposition();
 
     // Start at zero, peak halfway and end at zero.
-    double opacity = std::min(1.0 - pow(GetCurrentValue() - 0.5, 2) * 4.0,
-                              static_cast<double>(1.0));
-
-    popup_->SetOpacity(static_cast<unsigned char>(opacity * 255.0));
+    popup_->SetOpacity(static_cast<float>(
+        std::min(1.0 - pow(GetCurrentValue() - 0.5, 2) * 4.0, 1.0)));
   }
 }