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Replace prefetch logic #776

Job	Run time
Test Build	4m 42s
Test Browser on macOS (safari, main)	1m 7s
Test Browser on macOS (safari, default)	2m 35s
Test Browser on macOS (safari, disabled)	1m 41s
Test Browser on Linux (firefox, disabled)	1m 18s
Test Browser on Linux (chrome, disabled)	1m 12s
Test Browser on Linux (chrome, default)	1m 12s
Test Browser on Linux (firefox, default)	1m 26s
Test Browser on Linux (firefox, main)	55s
Test Shell (v8, disabled)	1m 30s
Test Shell (spidermonkey, disabled)	1m 55s
Test Shell (v8, default)	2m 42s
Test Browser on Linux (chrome, main)	34s
Test Shell (spidermonkey, default)	5m 29s
Test Shell (v8, main)	39s
Test Shell (jsc, disabled)	1m 44s
Test Shell (jsc, main)	42s
Test Shell (spidermonkey, main)	50s
Test Shell (jsc, default)	3m 5s
	35m 18s