Remove unused utility methods.

cc/base/math_util.h

Index: cc/base/math_util.h
diff --git a/cc/base/math_util.h b/cc/base/math_util.h
index 59f28ece4198548289b798f63b162ee08dd0f6aa..dca5dcf89491f94a30a273c2a2444d6fbf164a51 100644
--- a/cc/base/math_util.h
+++ b/cc/base/math_util.h
@@ -205,19 +205,9 @@ class CC_EXPORT MathUtil {
   static gfx::QuadF MapQuad(const gfx::Transform& transform,
                             const gfx::QuadF& quad,
                             bool* clipped);
-  static gfx::QuadF MapQuad3d(const gfx::Transform& transform,
-                              const gfx::QuadF& q,
-                              gfx::Point3F* p,
-                              bool* clipped);
   static gfx::PointF MapPoint(const gfx::Transform& transform,
                               const gfx::PointF& point,
                               bool* clipped);
-  static gfx::Point3F MapPoint(const gfx::Transform&,
-                               const gfx::Point3F&,
-                               bool* clipped);
-  static gfx::QuadF ProjectQuad(const gfx::Transform& transform,
-                                const gfx::QuadF& quad,
-                                bool* clipped);
   static gfx::PointF ProjectPoint(const gfx::Transform& transform,
                                   const gfx::PointF& point,
                                   bool* clipped);