Make shelf blur quality same as launcher's

Bug: None
Test: None
Change-Id: I697dcf3af1c6736e572d67ad254d815fd797402f
Reviewed-on: https://chromium-review.googlesource.com/c/1333897Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607639}

ash/shelf/shelf_widget.cc

@@ -44,7 +44,7 @@ namespace {
 
 constexpr int kShelfRoundedCornerRadius = 28;
 constexpr int kShelfBlurRadius = 10;
-constexpr float kShelfBlurQuality = 0.25f;
+constexpr float kShelfBlurQuality = 0.33f;
 
 // Return the first or last focusable child of |root|.
 views::View* FindFirstOrLastFocusableChild(views::View* root,