Merge pull request #1424 from google/using-string #2164

Job	Run time
Examples Rust nightly	3m 34s
Test Rust nightly	8m 33s
Examples Rust beta	3m 26s
Test forcing wrapper generation	6m 44s
Examples Rust stable	3m 57s
Examples macOS	3m 46s
Clippy	31s
Test Rust beta	8m 48s
Examples Windows (gnu)	6m 43s
Test Rust stable	8m 48s
Examples Windows (msvc)	5m 6s
Test macOS	10m 42s
Docs	42s
Test Windows (msvc)	14m 42s
Format	9s
Outdated	10s
Address Sanitizer	17m 27s
	1h 43m 48s

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