Merge pull request #262 from kmiller68/revert-replace-prefetch-logic #810

Job	Run time
Test Build	23s
Test Browser on macOS (safari, default)	1m 43s
Test Browser on macOS (safari, disabled)	1m 27s
Test Browser on macOS (safari, main)	59s
Test Browser on Linux (chrome, disabled)	52s
Test Browser on Linux (firefox, default)	1m 30s
Test Shell (spidermonkey, disabled)	1m 54s
Test Shell (jsc, disabled)	1m 45s
Test Browser on Linux (chrome, default)	1m 1s
Test Shell (v8, disabled)	1m 31s
Test Browser on Linux (firefox, main)	55s
Test Browser on Linux (chrome, main)	34s
Test Shell (v8, main)	36s
Test Shell (jsc, default)	3m 5s
Test Shell (v8, default)	2m 43s
Test Browser on Linux (firefox, disabled)	1m 18s
Test Shell (spidermonkey, main)	52s
Test Shell (spidermonkey, default)	5m 15s
Test Shell (jsc, main)	43s
	29m 6s

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