Added CERES_ prefix to the DISALLOW macros.

Change-Id: Ib81e9112e8bbc6ed6cb52f21825df0f6e659be51
diff --git a/internal/ceres/conjugate_gradients_solver.h b/internal/ceres/conjugate_gradients_solver.h
index 57f99e3..b8dfa56 100644
--- a/internal/ceres/conjugate_gradients_solver.h
+++ b/internal/ceres/conjugate_gradients_solver.h
@@ -65,7 +65,7 @@
 
  private:
   const LinearSolver::Options options_;
-  DISALLOW_COPY_AND_ASSIGN(ConjugateGradientsSolver);
+  CERES_DISALLOW_COPY_AND_ASSIGN(ConjugateGradientsSolver);
 };
 
 }  // namespace internal