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Due to the recent rework of how to decide if events should be recorded
or not, the test events created through sync-internals was not updated.
This fixes them by making two changes.

1. event_case() is now correctly set so that the service can identify
the type of event.

2. navigation_id's presence is not set if the text field is not filled
in, allowing it to bypass the requirement for history sync to be
enabled.

Bug: 792730
Change-Id: Icabf100da886cbd28efc8db2ce3e6e8cb4a50af1
Reviewed-on: https://chromium-review.googlesource.com/812975
Commit-Queue: Sky Malice <skym@chromium.org>
Reviewed-by: Patrick Noland <pnoland@google.com>
Cr-Commit-Position: refs/heads/master@{#522298}