Simplify application of perspective origin.

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index 541f04ae21efff028d47823b87110d504e8e78a1..6c44b66f4f7c33601137b5ff5bf69e51ca593c77 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -908,24 +908,8 @@ TransformationMatrix DeprecatedPaintLayer::perspectiveTransform() const
     if (!style.hasPerspective())
         return TransformationMatrix();
 
-    // Maybe fetch the perspective from the backing?
-    const IntRect borderBox = toLayoutBox(layoutObject())->pixelSnappedBorderBoxRect();
-    const float boxWidth = borderBox.width();
-    const float boxHeight = borderBox.height();
-
-    float perspectiveOriginX = floatValueForLength(style.perspectiveOriginX(), boxWidth);
-    float perspectiveOriginY = floatValueForLength(style.perspectiveOriginY(), boxHeight);
-
-    // A perspective origin of 0,0 makes the vanishing point in the center of the element.
-    // We want it to be in the top-left, so subtract half the height and width.
-    perspectiveOriginX -= boxWidth / 2.0f;
-    perspectiveOriginY -= boxHeight / 2.0f;
-
     TransformationMatrix t;
-    t.translate(perspectiveOriginX, perspectiveOriginY);
     t.applyPerspective(style.perspective());
-    t.translate(-perspectiveOriginX, -perspectiveOriginY);
-
     return t;
 }