Revert "COMPMID-1329: Add support for GenerateProposals operator in CL"

This reverts commit cd96a26f67bfbb9b0efe6e0e2b229d0b46b4e3e6.

Change-Id: I1d46f37095c94968ad4f3b781269adaa03e2e410
Signed-off-by: giuros01 <giuseppe.rossini@arm.com>
Reviewed-on: https://review.mlplatform.org/706
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index 542c129..6a0be1b 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018 ARM Limited.
+ * Copyright (c) 2018-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -44,7 +44,6 @@
 class EltwiseLayerNode;
 class FlattenLayerNode;
 class FullyConnectedLayerNode;
-class GenerateProposalsLayerNode;
 class InputNode;
 class NormalizationLayerNode;
 class NormalizePlanarYUVLayerNode;