Revert "Add WEB session tag for brower's power hint session control."

Revert submission 30772387-web-session-tag

Reason for revert: New feature request have to go through Android FR process.

Reverted changes: /q/submissionid:30772387-web-session-tag

Change-Id: Ifdfb8af39ae05552d79f3fc7f303e884e129f679
2 files changed