Revert "Add a pool of workers for the method walk"

This reverts commit 39ecd05d90a790cdf2dfca5c06eae672eb105d4c.

Change-Id: I2b8f9d225dfd4a7dea5551025c340de9927d00a5
Merge "Revert "Add a pool of workers for the method walk"" into R1.06