Remove unneeded 1px vertical offset for left/right double box sides

Source/core/paint/ObjectPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/ObjectPainter.h"
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/style/ComputedStyle.h"
@@ skipping 182 matching lines @@
         graphicsContext->setShouldAntialias(antialias);
 
         switch (side) {
         case BSTop:
         case BSBottom:
             graphicsContext->drawRect(IntRect(x1, y1, length, thirdOfThickness));
             graphicsContext->drawRect(IntRect(x1, y2 - thirdOfThickness, length, thirdOfThickness));
             break;
         case BSLeft:
         case BSRight:
-            // FIXME: Why do we offset the border by 1 in this case but not the other one?
-            if (length > 1) {
-                graphicsContext->drawRect(IntRect(x1, y1 + 1, thirdOfThickness, length - 1));
-                graphicsContext->drawRect(IntRect(x2 - thirdOfThickness, y1 + 1, thirdOfThickness, length - 1));
-            }
+            graphicsContext->drawRect(IntRect(x1, y1, thirdOfThickness, length));
+            graphicsContext->drawRect(IntRect(x2 - thirdOfThickness, y1, thirdOfThickness, length));
             break;
         }
 
         graphicsContext->setShouldAntialias(wasAntialiased);
         graphicsContext->setStrokeStyle(oldStrokeStyle);
         return;
     }
 
     int adjacent1BigThird = ((adjacentWidth1 > 0) ? adjacentWidth1 + 1 : adjacentWidth1 - 1) / 3;
     int adjacent2BigThird = ((adjacentWidth2 > 0) ? adjacentWidth2 + 1 : adjacentWidth2 - 1) / 3;
@@ skipping 123 matching lines @@
         quad[1] = FloatPoint(x1, y2 - std::max(adjacentWidth2, 0));
         quad[2] = FloatPoint(x2, y2 - std::max(-adjacentWidth2, 0));
         quad[3] = FloatPoint(x2, y1 + std::max(-adjacentWidth1, 0));
         break;
     }
 
     graphicsContext->fillPolygon(4, quad, color, antialias);
 }
 
 } // namespace blink