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Replace prefetch logic (#251) #778

Job	Run time
Test Browser on macOS (safari, main)	55s
Test Browser on macOS (safari, default)	2m 0s
Test Browser on Linux (chrome, main)	29s
Test Build	4m 48s
Test Browser on macOS (safari, disabled)	1m 45s
Test Browser on Linux (firefox, main)	57s
Test Browser on Linux (firefox, default)	1m 35s
Test Shell (jsc, default)	1m 53s
Test Browser on Linux (chrome, default)	1m 11s
Test Shell (v8, main)	38s
Test Shell (jsc, disabled)	1m 41s
Test Browser on Linux (chrome, disabled)	1m 8s
Test Shell (spidermonkey, default)	5m 10s
Test Shell (jsc, main)	43s
Test Shell (v8, default)	2m 45s
Test Browser on Linux (firefox, disabled)	1m 26s
Test Shell (spidermonkey, main)	50s
Test Shell (spidermonkey, disabled)	2m 0s
Test Shell (v8, disabled)	1m 39s
	33m 33s