Preserve original border colors for border-style inset | outset.

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index 12e6b65913f6a082e81a0f28a4257456900584ed..86848103874ab9e7becda127cf1c68218e9da3c4 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -2030,8 +2030,7 @@ Color ComputedStyle::colorIncludingFallback(int colorProperty,
   // FIXME: Treating styled borders with initial color differently causes
   // problems, see crbug.com/316559, crbug.com/276231
   if (!visitedLink &&
-      (borderStyle == BorderStyleInset || borderStyle == BorderStyleOutset ||
-       borderStyle == BorderStyleRidge || borderStyle == BorderStyleGroove))
+      (borderStyle == BorderStyleRidge || borderStyle == BorderStyleGroove))
     return Color(238, 238, 238);
   return visitedLink ? visitedLinkColor() : color();
 }