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This CL removes inspect_tool_highlight.html and replaces it with
resources produced by DevTools[1], where the implementation has been
moved to in a separate CL[2].

[1]: https://goo.gle/devtools-overlay-reuse
[2]: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2192892

Bug: 1078267
Change-Id: I95d3faef98470e13430ed251cf135e59269358d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2194865
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774030}