Don't render border images when border-style is none

third_party/WebKit/Source/core/style/BorderValue.h

Index: third_party/WebKit/Source/core/style/BorderValue.h
diff --git a/third_party/WebKit/Source/core/style/BorderValue.h b/third_party/WebKit/Source/core/style/BorderValue.h
index 1713110cf47c567fb45f7334f7687ebf57ec759f..b08f5130da13bb6d5837cf4f7f5092498e823f91 100644
--- a/third_party/WebKit/Source/core/style/BorderValue.h
+++ b/third_party/WebKit/Source/core/style/BorderValue.h
@@ -45,9 +45,9 @@ public:
     {
     }
 
-    bool nonZero(bool checkStyle = true) const
+    bool nonZero() const
     {
-        return width() && (!checkStyle || m_style != BNONE);
+        return width() && (m_style != BNONE);
     }
 
     bool isTransparent() const
@@ -55,9 +55,9 @@ public:
         return !m_colorIsCurrentColor && !m_color.alpha();
     }
 
-    bool isVisible(bool checkStyle = true) const
+    bool isVisible() const
     {
-        return nonZero(checkStyle) && !isTransparent() && (!checkStyle || m_style != BHIDDEN);
+        return nonZero() && !isTransparent() && (m_style != BHIDDEN);
     }
 
     bool operator==(const BorderValue& o) const