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If excessively large files, or too many files, were passed to
navigator.share(), we rejected the request but also incorrectly
updated state (client_ in NavigatorShare), leading to future share
attempts failing with InvalidStateError
"A earlier share had not yet completed."

We now only set client_ when we are about to make a mojo call.

Bug: 1146317
Change-Id: I8ced104d0c2486c75987847c0f23c2d632a6cc9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522813
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825243}