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/frontend/Layers.h b/arm_compute/graph/frontend/Layers.h
index 72353a2..d10fa7f 100644
--- a/arm_compute/graph/frontend/Layers.h
+++ b/arm_compute/graph/frontend/Layers.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018 ARM Limited.
+ * Copyright (c) 2018-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -608,44 +608,6 @@
     const QuantizationInfo        _out_quant_info;
 };
 
-/** Generate Proposals Layer */
-class GenerateProposalsLayer final : public ILayer
-{
-public:
-    /** Construct a generate proposals layer.
-     *
-     * @param[in] ss_scores  Graph sub-stream for the scores.
-     * @param[in] ss_deltas  Graph sub-stream for the deltas.
-     * @param[in] ss_anchors Graph sub-stream for the anchors.
-     * @param[in] info       Generate Proposals operation information.
-     */
-    GenerateProposalsLayer(SubStream &&ss_scores, SubStream &&ss_deltas, SubStream &&ss_anchors, GenerateProposalsInfo info)
-        : _ss_scores(std::move(ss_scores)), _ss_deltas(std::move(ss_deltas)), _ss_anchors(std::move(ss_anchors)), _info(info)
-    {
-    }
-
-    /** Create layer and add to the given stream.
-     *
-     * @param[in] s Stream to add layer to.
-     *
-     * @return ID of the created node.
-     */
-    NodeID create_layer(IStream &s) override
-    {
-        NodeParams  common_params = { name(), s.hints().target_hint };
-        NodeIdxPair scores        = { _ss_scores.tail_node(), 0 };
-        NodeIdxPair deltas        = { _ss_deltas.tail_node(), 0 };
-        NodeIdxPair anchors       = { _ss_anchors.tail_node(), 0 };
-        return GraphBuilder::add_generate_proposals_node(s.graph(), common_params, scores, deltas, anchors, _info);
-    }
-
-private:
-    SubStream             _ss_scores;
-    SubStream             _ss_deltas;
-    SubStream             _ss_anchors;
-    GenerateProposalsInfo _info;
-};
-
 /** Normalization Layer */
 class NormalizationLayer final : public ILayer
 {