Make fixed-width elements not center by default.

sky/engine/core/rendering/RenderBox.cpp

Index: sky/engine/core/rendering/RenderBox.cpp
diff --git a/sky/engine/core/rendering/RenderBox.cpp b/sky/engine/core/rendering/RenderBox.cpp
index eaa4339067fb77e435fceb07a6b0be5f6ff4e79e..54cad1a3609de3dc55af6adfa3dd705d5452a31c 100644
--- a/sky/engine/core/rendering/RenderBox.cpp
+++ b/sky/engine/core/rendering/RenderBox.cpp
@@ -1648,8 +1648,7 @@ void RenderBox::computeMarginsForDirection(MarginDirection flowDirection, const
 
     // CSS 2.1: "If both 'margin-left' and 'margin-right' are 'auto', their used values are equal. This horizontally centers the element
     // with respect to the edges of the containing block."
-    if ((marginStartLength.isAuto() && marginEndLength.isAuto() && marginBoxWidth < containerWidth)
-        || (!marginStartLength.isAuto() && !marginEndLength.isAuto())) {
+    if (marginStartLength.isAuto() && marginEndLength.isAuto() && marginBoxWidth < containerWidth) {
         // Other browsers center the margin box for align=center elements so we match them here.
         LayoutUnit centeredMarginBoxStart = std::max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
         marginStart = centeredMarginBoxStart + marginStartWidth;