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The referrer policy is only used when dragging a link out of the WebView
results in a download. This is handled on Windows when the mime type is
'downloadurl'. This CL avoids storing the policy unconditionally when
converting the DragData Mojo type to DropData.

Bug: 1039255
Change-Id: Id0b94a7bddb274b53aba2e5c163407f0c875d95c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391068Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#804573}