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Replace prefetch logic #777

Job	Run time
Test Browser on macOS (safari, main)	1m 12s
Test Browser on Linux (chrome, main)	35s
Test Build	4m 46s
Test Browser on Linux (firefox, disabled)	1m 12s
Test Browser on Linux (chrome, default)	1m 7s
Test Shell (v8, main)	38s
Test Browser on Linux (chrome, disabled)	1m 6s
Test Shell (jsc, disabled)	1m 45s
Test Browser on Linux (firefox, main)	59s
Test Shell (v8, default)	2m 42s
Test Browser on macOS (safari, default)	1m 26s
Test Shell (jsc, main)	45s
Test Shell (jsc, default)	3m 23s
Test Shell (spidermonkey, disabled)	1m 57s
Test Browser on macOS (safari, disabled)	1m 26s
Test Shell (spidermonkey, main)	47s
Test Shell (spidermonkey, default)	5m 11s
Test Shell (v8, disabled)	1m 38s
Test Browser on Linux (firefox, default)	1m 40s
	34m 15s