[typescript] TypeScript-ify profiler/HeapTimelineOverview.js
[typescript] TypeScript-ify profiler/HeapTimelineOverview.js

Bug: 1011811
Change-Id: If08cc6e9e3a981a6e221e817ca0d7cea45f1f28f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2537962
Auto-Submit: Peter Marshall <6d0eecbeb7fb9d172f49b4b32481d2466fd89429@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend