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Only in a debug build we can enter in the branch
"content::hasWebUIScheme" (:758) if the scheme is either "chrome://" or
"devtools://". Later, constructing the WebURILoader (in :772 before the
patch), there is the assumption that the uri scheme is always
kChromeUIScheme. This was causing me  crash of devtools while I was
trying to open it on a page under "devtools://devtools/...".
The crash was generated by web_ui_url_loader_factory.cc:254, where
`scheme_` was "chrome", while `request.url.scheme()` was "devtools"

Change-Id: If02ea147d494ed64c7f7dc560095f223c11f7dfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1687408
Commit-Queue: Nicolò Mazzucato <nicomazz@google.com>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676911}