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The Cinnamon Desktop Environment requires file handlers to specify a %F
argument to specify where file arguments should be placed. Other DEs
(such as Plasma) don't have this restriction.

The fix is to (conditionally) append a '%F' argument to the command line
of web apps with file handlers. If the argument is added unconditionally
all web apps will show up as options in the 'Choose Another App' dialog,
which is undesirable.

Bug: 1027994
Change-Id: I89f882c0854b3ee313fce6eea1845052a884c173
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933683
Commit-Queue: Jay Harris <harrisjay@google.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718892}