TransformationMatrix::inverse should use multiplication instead of division

third_party/WebKit/Source/platform/transforms/TransformationMatrix.cpp

 /*
  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 479 matching lines @@
   result[2][2] = tmp1[1];
   result[2][3] = -tmp3[1];
   result[3][0] = -tmp0[0];
   result[3][1] = tmp2[0];
   result[3][2] = -tmp1[0];
   result[3][3] = tmp3[0];
 #else
   // Calculate the adjoint matrix
   adjoint(matrix, result);
 
+  double rdet = 1 / det;
+
   // Scale the adjoint matrix to get the inverse
   for (int i = 0; i < 4; i++)
     for (int j = 0; j < 4; j++)
-      result[i][j] = result[i][j] / det;
+      result[i][j] = result[i][j] * rdet;
 #endif
   return true;
 }
 
 // End of code adapted from Matrix Inversion by Richard Carling
 
 // Perform a decomposition on the passed matrix, return false if unsuccessful
 // From Graphics Gems: unmatrix.c
 
 // Transpose rotation portion of matrix a, return b
@@ skipping 1417 matching lines @@
       decomposition.translateZ, decomposition.scaleX, decomposition.scaleY,
       decomposition.scaleZ, decomposition.skewXY, decomposition.skewXZ,
       decomposition.skewYZ, decomposition.quaternionX,
       decomposition.quaternionY, decomposition.quaternionZ,
       decomposition.quaternionW, decomposition.perspectiveX,
       decomposition.perspectiveY, decomposition.perspectiveZ,
       decomposition.perspectiveW);
 }
 
 }  // namespace blink