Upgrade to chromium/6734 and fix wgpu's webgpu.hpp #10

Job	Run time
build (Linux-x64, DAWN, SHARED, Debug)	18s
build (Linux-x64, DAWN, SHARED, Release)	18s
build (Linux-x64, WGPU, SHARED, Debug)	23s
build (Linux-x64, WGPU, SHARED, Release)	21s
build (Linux-x64, WGPU, STATIC, Debug)	15s
build (Linux-x64, WGPU, STATIC, Release)	47s
build (Windows-MSVC-x64, DAWN, SHARED, Debug)	44s
build (Windows-MSVC-x64, DAWN, SHARED, Release)	44s
build (Windows-MSVC-x64, WGPU, SHARED, Debug)	1m 0s
build (Windows-MSVC-x64, WGPU, SHARED, Release)	29s
build (Windows-MSVC-x64, WGPU, STATIC, Debug)	59s
build (Windows-MSVC-x64, WGPU, STATIC, Release)	1m 0s
build (Windows-MSYS-x64, DAWN, SHARED, Debug)	1m 16s
build (Windows-MSYS-x64, DAWN, SHARED, Release)	1m 22s
build (Windows-MSYS-x64, WGPU, SHARED, Debug)	1m 7s
build (Windows-MSYS-x64, WGPU, SHARED, Release)	1m 23s
build (Windows-MSYS-x64, WGPU, STATIC, Debug)	1m 10s
build (Windows-MSYS-x64, WGPU, STATIC, Release)	1m 12s
build (MacOS-x64, WGPU, SHARED, Debug)	16s
build (MacOS-x64, WGPU, SHARED, Release)	21s
build (MacOS-x64, WGPU, STATIC, Debug)	19s
build (MacOS-x64, WGPU, STATIC, Release)	17s
build (MacOS-ARM, DAWN, SHARED, Debug)	11s
build (MacOS-ARM, DAWN, SHARED, Release)	15s
build (MacOS-ARM, WGPU, SHARED, Debug)	10s
build (MacOS-ARM, WGPU, SHARED, Release)	10s
build (MacOS-ARM, WGPU, STATIC, Debug)	9s
build (MacOS-ARM, WGPU, STATIC, Release)	11s
	17m 7s

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