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This fixes non standard startup parameters like
- external pdf files
- extension search text/images

Bug: 1108801
Change-Id: If38c4bb795ec1dfb920a3b5970e4ae6423e4df15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320872Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792255}