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Clean up: Fix indentation in background.js

Bug: N/A
Change-Id: I8e1ff49570262172e14dc0cb8876d03c0f8958a4
Ax-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343766
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Auto-Submit: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796635}