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We should be calling standard_isolated_script_merge for isolated
scripts. This will further enable using the gtest test type for
isolated scripts.

Bug: 931731
Bug: 1131231
Change-Id: Idf40e1978104b79501700944b30c581159e35341
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443936Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813081}