Update matrix distance metric to account for snapping.

ui/gfx/transform_util.cc

Index: ui/gfx/transform_util.cc
diff --git a/ui/gfx/transform_util.cc b/ui/gfx/transform_util.cc
index c23f87d8448c49de146a68b9ff10152b2a04f8f3..5c9fb50ff159b948cd9911a247a830258c65a652 100644
--- a/ui/gfx/transform_util.cc
+++ b/ui/gfx/transform_util.cc
@@ -515,20 +515,4 @@ std::string DecomposedTransform::ToString() const {
       quaternion[3]);
 }
 
-float MatrixDistance(const Transform& a, const Transform& b) {
-  double sum = 0.0;
-
-  const SkMatrix44& a_data = a.matrix();
-  const SkMatrix44& b_data = b.matrix();
-
-  for (int row = 0; row < 4; ++row) {
-    for (int col = 0; col < 4; ++col) {
-      double diff = a_data.get(row, col) - b_data.get(row, col);
-      sum += diff * diff;
-    }
-  }
-
-  return static_cast<float>(std::sqrt(sum));
-}
-
 }  // namespace gfx