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This tests that an extension background page is able to declare
variables whose names are the same as guest view elements without the
declarations being considered syntax errors.

Bug: 1014385
Change-Id: I5ca92d739fe04fece2078f53e9f5eca4f73b040f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864407Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712188}