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Fix import from Chrome Devtools performance tab in Chrome >= 114 (#422)

The file format uses by Chrome Devtools performance tab periodically changes. It uses the Chrome trace event format (https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview).

This format, however, has two different types: one is `TraceEvent[]`, the other is `{traceEvents: traceEvent[]}`. The importer for non-Chrome devtools profiles already handled this, but the one for Chrome Devtools didn't because Chrome < 114 never used it. It seems like they changed the file format. This PR addresses that change.

Fixes #420

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