Fix duplicate extensions test name

Rename one of JavaScript test functions, to avoid clashing
with another test function. (The clash only affected logs,
so it's a pure cleanup CL.)

Bug: none
Test: none
Change-Id: Idaa5aa787b3a5162c6ac9dfd6c4145b2a0b79503
Reviewed-on: https://chromium-review.googlesource.com/c/1474668
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633488}
1 file changed