[cleanup] Remove work-around for click-gutter-breakpoint.js test.
[cleanup] Remove work-around for click-gutter-breakpoint.js test.

After the bogus test was removed in https://crrev.com/c/2718105, we can
no longer need the work-around for the subtle timing issue in the
DebuggerWorkspaceBinding.uiLocationToRawLocations() method.

Bug: chromium:1142705
Change-Id: I787e8c54d60a72caf120dd6a544e2f346e16fb45
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2721952
Commit-Queue: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Auto-Submit: Benedikt Meurer <024a1e0af501338d11c3b837c6193d11c140d792@chromium.org>
Reviewed-by: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>

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