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This just renames the extensions in order to make build speed summaries
distinguish the two.

Bug: 1067273
Change-Id: I0a1e14cfed3557d29cd6beb0987436cacfaf6b65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140908
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757855}