Expose default ctor of SQS and remove Create and Copy funciton of SQS

cc/quads/shared_quad_state.cc

Index: cc/quads/shared_quad_state.cc
diff --git a/cc/quads/shared_quad_state.cc b/cc/quads/shared_quad_state.cc
index 3832886487d70d3f1a7eb6b737013427a107babc..444d3300bed1b9d154680131ffa632ac8992b5c7 100644
--- a/cc/quads/shared_quad_state.cc
+++ b/cc/quads/shared_quad_state.cc
@@ -19,14 +19,6 @@ SharedQuadState::~SharedQuadState() {
       "cc::SharedQuadState", this);
 }
 
-scoped_ptr<SharedQuadState> SharedQuadState::Create() {
-  return make_scoped_ptr(new SharedQuadState);
-}
-
-scoped_ptr<SharedQuadState> SharedQuadState::Copy() const {
-  return make_scoped_ptr(new SharedQuadState(*this));
-}
-
 void SharedQuadState::CopyFrom(const SharedQuadState* other) {
   *this = *other;
 }