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Allow chrome://file-manager to connect to the image loader. Note: this
assumes chrome://file-manager has enabled chrome.runtime.sendMessage.

Since the manifest.json "externally_connectable" permission is used to
allow chrome://file_manager access, we must now list all the extension
|ids| that are allowed to connect to the image loader extension in the
"externally_connectable" permission. The ids are taken from the static
ImageLoader.ALLOWED_CLIENT_ORIGINS list.

Also add 'chrome://file-manager' to ImageLoader.ALLOWED_CLIENT_ORIGINS
list, which is still used to allow (or block) connecting sources based
on their URL origin.

Bug: 1113981, 1123261
Change-Id: I96b0db1a0155510f95285cda8f5c7c62e6fece9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600433
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839653}