Fixed an apparent bug introduced in https://codereview.chromium.org/1503563004/
Fixed an apparent bug introduced in
https://codereview.chromium.org/1503563004/

This is a bug in DesktopMediaID class's overloaded operator <. "other." is missed in front of web_content_id

BUG=557222

Review URL: https://codereview.chromium.org/1647583002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372353}

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