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Currently we only call SetProfile once during initialization with
non-null |profile|. Remove preconditions that allow null |profile| if
|profile_| is already set.

This simplifies metrics recording logic in upcoming change as we no
longer consider null |profile|.

Bug: 929583
Change-Id: I68b4ac064ec07984844dc04f92ea46cf36613a21
Reviewed-on: https://chromium-review.googlesource.com/c/1493632Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Shao-Chuan Lee <shaochuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636816}