Gtk3: Remove box-shadow when rendering background colors

chrome/browser/ui/libgtkui/gtk_util.cc

Index: chrome/browser/ui/libgtkui/gtk_util.cc
diff --git a/chrome/browser/ui/libgtkui/gtk_util.cc b/chrome/browser/ui/libgtkui/gtk_util.cc
index 56f565b9d1dd307ad78e1b163b6ea3d6f6f9476e..9ecf876fe03e9672633d11624fdecca5d55cf7b7 100644
--- a/chrome/browser/ui/libgtkui/gtk_util.cc
+++ b/chrome/browser/ui/libgtkui/gtk_util.cc
@@ -372,8 +372,11 @@ void RemoveBorders(GtkStyleContext* context) {
       "border-radius: 0px;"
       "border-width: 0px;"
       "border-image-width: 0px;"
+      "box-shadow: none;"
       "padding: 0px;"
       "margin: 0px;"
+      "outline: none;"
+      "outline-width: 0px;"
       "}");
   ApplyCssToContext(context, provider);
 }
@@ -384,8 +387,11 @@ void AddBorders(GtkStyleContext* context) {
       "border-style: solid;"
       "border-radius: 0px;"
       "border-width: 1px;"
+      "box-shadow: none;"
       "padding: 0px;"
       "margin: 0px;"
+      "outline: none;"
+      "outline-width: 0px;"
       "}");
   ApplyCssToContext(context, provider);
 }