CPUProfiler: It is not clear why we are using Handle<Object> for scriptId. Lets flip it into Smi/int.

By the nature it is integer. So we can work with it as with Smi internaly and use int in the external API.

BUG=none
TEST=existing tests
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/17600006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15327 ce2b1a6d-e550-0410-aec6-3dcde31c8c00