Draw infobar arrow border with width of 1px on any scale factor.

chrome/browser/ui/views/infobars/infobar_view.cc

Index: chrome/browser/ui/views/infobars/infobar_view.cc
diff --git a/chrome/browser/ui/views/infobars/infobar_view.cc b/chrome/browser/ui/views/infobars/infobar_view.cc
index b0012dc05b02af4bc2c6072ce4d2f8a461c50246..ff4a7cf84d25f663c9cf705287c2ff927a7cc6c3 100644
--- a/chrome/browser/ui/views/infobars/infobar_view.cc
+++ b/chrome/browser/ui/views/infobars/infobar_view.cc
@@ -200,9 +200,6 @@ void InfoBarView::Layout() {
       stroke_path_.rLineTo(arrow_fill_half_width, arrow_fill_height);
 
       fill_path_ = stroke_path_;
-      // Move the top of the fill path up to the top of the separator and then
-      // extend it down all the way through.
-      fill_path_.offset(0, -separator_height * SK_ScalarHalf);
       // This 0.01 hack prevents the fill from filling more pixels on the right
       // edge of the arrow than on the left.
       const SkScalar epsilon = 0.01f;
@@ -213,10 +210,8 @@ void InfoBarView::Layout() {
     }
   }
   if (bar_height()) {
-    fill_path_.addRect(
-        0.0, SkIntToScalar(arrow_height()), SkIntToScalar(width()),
-        SkIntToScalar(
-            height() - InfoBarContainerDelegate::kSeparatorLineHeight));
+    fill_path_.addRect(0.0, SkIntToScalar(arrow_height()),
+                       SkIntToScalar(width()), SkIntToScalar(height()));
   }
 
   child_container_->SetBounds(