Prepare SourcesPanel.js for asynchronous source mapping
Prepare SourcesPanel.js for asynchronous source mapping

This CL prepares SourcesPanel.js for asynchronous
{rawLocationToUILocation} and asynchronous live locations by adding
async/await at the necessary call-sites.

R=f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org

Bug: chromium:1032016
Change-Id: I6189019045ff1fb2855a3b58e606fdb19d5a3a7e
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2071879
Reviewed-by: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Commit-Queue: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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