Revert "FIP-0076: Add ListAllocations/ListClaims verified registry methods. (#865)" (#877)

* Revert "FIP-0076: Add ListAllocations/ListClaims verified registry methods. (#865)"
This reverts commit adb91f4.

* Keep SectorContentChanged method number

Author: anorth

FIPS/fip-0076.md

@@ -561,63 +561,6 @@ struct GetDealSectorReturn {
 }
 ```
 
-### Verified registry actor
-
-The built-in verified registry actor exports FRC-0042 methods to iterate all allocations and claims.
-`ListAllocations` (method 241218346) returns all allocation IDs up to some caller-specified limit, 
-and an opaque cursor which can be used to continue the listing where the first response left off.
-`ListClaims` (method 3587470581) similarly returns all claim IDs up to some limit, and a cursor for continuation.
-The order of iteration is undefined to the caller, and will match the internal HAMT structure's ordering.
-A cursor is tied to the actor state from which it was generated.
-Clients can only assume a cursor is valid for use immediately after it is returned.
-
-```
-// Exported API
-struct ListAllocationsParams {
-    Cursor: RawBytes,
-    Limit: u64,
-}
-
-struct AllocationKey {
-    Client: ActorID,
-    ID: AllocationID,
-}
-
-struct ListAllocationsResponse {
-    Allocations: Vec<AllocationKey>,
-    NextCursor: Option<RawBytes>,
-}
-
-struct ListClaimsParams {
-    Cursor: RawBytes,
-    Limit: u64,
-}
-
-struct ClaimKey {
-    Provider: ActorID,
-    ID: ClaimID,
-}
-
-struct ListClaimsResponse {
-    Claims: Vec<ClaimKey>,
-    NextCursor: Option<RawBytes>,
-}
-```
-
-A cursor is a serialized representation of the HAMT root CID, the next client/provider ID,
-and the next allocation/claim ID for that client/provider.
-A cursor is rejected with `USR_ILLEGAL_ARGUMENT` if the HAMT root does not match the verified registry state,
-or the IDs do not exist.
-
-```
-// Internal structure
-struct Cursor {
-    Root: Cid,
-    OuterKey: ActorID,
-    InnerKey: u64, // Allocation or claim ID
-}
-
-```
 ### Migration
 
 The built-in market actor's `ProviderSectors` mapping is initialised from the existing deal state
@@ -698,12 +641,6 @@ as a side effect of publishing a deal.
 The reason for this change is that verified allocations and deals are independent: a client can allocate DataCap
 without necessarily involving the built-in market actor, and save the SP significant gas costs by doing so.
 
-### Verified registry iteration APIs
-
-The methods to list allocations and claims provide simpler accessibility of these structures,
-since in many cases they may be the only on-chain representation of a "deal".
-The methods are primarily intended to be invoked from off-chain, replacing direct state inspection.
-
 ## Backwards Compatibility
 
 This proposal deprecated the miner methods `PreCommitSector` (method 6), `PreCommitSectorBatch` (method 25),
@@ -890,7 +827,6 @@ This proposal makes that behaviour cheaper by not storing the meaningless metada
 Implementation of the protocol changes is being developed in the `integration/direct-onboarding`
 [branch of the built-in actors](https://github.com/filecoin-project/builtin-actors/tree/integration/direct-onboarding)
 repository.
-The new verified registry methods are implemented in https://github.com/filecoin-project/builtin-actors/pull/1468.
 
 ## Copyright