Add sharing flag to file open during unsafe image test. This fixes an issue with the unsafe image test when it's run concurrently. Without the sharing flag the open can sometimes fails depending on timing which makes the test flaky.
Add sharing flag to file open during unsafe image test.
This fixes an issue with the unsafe image test when it's run concurrently.
Without the sharing flag the open can sometimes fails depending on timing
which makes the test flaky.

BUG=594462

Review URL: https://codereview.chromium.org/1791383003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#382128}

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