Remove chainContext object (#1683)

accounts/abi/bind/backends/simulated.go

cmd/integration/commands/snapshot_check.go

cmd/integration/commands/stages.go

cmd/integration/commands/state_stages.go

cmd/rpcdaemon/commands/debug_api.go

cmd/rpcdaemon/commands/eth_receipts.go

cmd/rpcdaemon/commands/trace_filtering.go

cmd/rpcdaemon/commands/tracing.go

cmd/state/commands/opcode_tracer.go

cmd/utils/cmd.go

consensus/clique/clique_test.go

core/blockchain.go

core/chain_makers.go

core/evm.go

core/state_prefetcher.go

core/state_processor.go

core/vm/runtime/runtime_test.go

eth/api_backend.go

eth/downloader/downloader.go

eth/gasprice/gasprice_test.go