chore(web): Remove unnecessary bound from GrpcWebLayer (#1986) #3455

Job	Run time
codegen	36s
cargo-deny check	20s
clippy	59s
Interop Tests (ubuntu-latest)	38s
check (ubuntu-latest)	2m 27s
Interop Tests (macOS-latest)	1m 28s
Interop Tests (windows-latest)	2m 18s
Check MSRV	41s
check (macOS-latest)	2m 59s
rustfmt	8s
check (windows-latest)	4m 39s
Check unused dependencies	3m 47s
test (ubuntu-latest)	3m 14s
check-external-types	52s
test (macOS-latest)	1m 54s
semver	58s
test (windows-latest)	5m 58s
	33m 56s

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