The current trace scoping failed to accomplish what it intended to do
it failed in 2 aspects:
First, when new trace events were added in
https://codereview.chromium.org/1770353002/ they escaped the scopes.
Secondly, a webgl code interacts with the V8 Objects directly using
the EXECUTION_PRIMITIVE context that does not generate any TRACE_EVENTs
resulting in a lot of empty scopes (breaking analysis on TBM webgl benchmarks)
https://crbug.com/590761.

I am removing the calls for now until figuring out a better approach for both issues.

BUG=590761,v8:4565
LOG=N

Review URL: https://codereview.chromium.org/1807433002

Cr-Commit-Position: refs/heads/master@{#34799}