DescriptionFiles.app: Add guard closure for selectedAsyncData.
The FileTransferController#selectedAsyncData is cache of data that cannot be obtained synchronously.
This is needed for assigning the data to DataTransfer in the event handler.
The data can be null if the event is dispatched before the data is obtained.
BUG=431650
TEST=None
TBR=fukino
Review URL: https://codereview.chromium.org/704333003
Cr-Commit-Position: refs/heads/master@{#303444}
(cherry picked from commit 5bb64a5b8ff45d1326552f70f687f378a76af97f)
Committed: https://chromium.googlesource.com/chromium/src/+/9aa8420e0f237267a3d612f749872884af378388
Patch Set 1 #
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