[tools/chrome_proxy] Update inspector_network data collecting code to trace_data.AddTraceFor

The API trace_data.AddEventsTo is replaced by trace_data.AddTraceFor in
https://codereview.chromium.org/2619073002/

BUG=catapult:#3119
TBR=bustamante@chromium.org

Review-Url: https://codereview.chromium.org/2630193002
Cr-Commit-Position: refs/heads/master@{#443817}
1 file changed