Audit of kConstants missing the const qualifier

webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc

Index: webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc
diff --git a/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc b/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc
index 31fde0aec624915def8af9fb16a16a50d51a57ec..b411686143e2bf5ada1d1151b82d3d666385eff8 100644
--- a/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc
+++ b/webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.cc
@@ -179,7 +179,8 @@ FecMaskType PacketMaskTable::InitMaskType(FecMaskType fec_mask_type,
 
 // Returns the pointer to the packet mask tables corresponding to type
 // |fec_mask_type|.
-const uint8_t*** PacketMaskTable::InitMaskTable(FecMaskType fec_mask_type) {
+const uint8_t* const* const* PacketMaskTable::InitMaskTable(
+    FecMaskType fec_mask_type) {
   switch (fec_mask_type) {
     case kFecMaskRandom: {
       return kPacketMaskRandomTbl;