Add reset method during initializing webkit bundle

Add reset method during initializing webkit bundle

[Issue#] JIRA(#N_SE-20674)
[Problem] Event handler isn't called
[Cause] After add commit for enhancement launching time,
event handler doesn't work.
Root cause is that pipe in the event handler is copyed during forking.
This cause occurred that event sends to parent process(UI)
even event is created by child process.
[Solution] Add reset method for event handler during
initializing webkit bundle.
[SCMRequest] must be imported with wrt-commons
https://tizendev.org/gerrit/#/c/32544/

Change-Id: I404d3a0051115c9c03d9cb7dd7b175156275cea4