Reverted unintended changes to nonlinear.i

Author: mkielo3

gtsam/nonlinear/nonlinear.i

@@ -725,13 +725,5 @@ virtual class BatchFixedLagSmoother : gtsam::FixedLagSmoother {
   VALUE calculateEstimate(size_t key) const;
 };
 
-#include <gtsam/nonlinear/ExtendedKalmanFilter.h>
-template<T = {gtsam::Point2, gtsam::Pose2, gtsam::Pose3}>
-class ExtendedKalmanFilter {
-    ExtendedKalmanFilter(size_t key_initial, T x_initial, gtsam::noiseModel::Gaussian* P_initial);
-    T predict(const gtsam::NoiseModelFactor& motionFactor);
-    T update(const gtsam::NoiseModelFactor& measurementFactor);
-    gtsam::JacobianFactor* Density() const;
-};
 
 }  // namespace gtsam