DOMTimer: Remove one (WTF_LOG) of the *three* kinds of logging.
DOMTimer: Remove one (WTF_LOG) of the *three* kinds of logging.

DOMTimer has Tracing, Inspector Instrumentation *and* WTF logging. I'm
removing the WTF logging. It looks like Tracing is the newest and an
adequate mechanism, so I'm removing the WTF_LOGs.

This is refactoring in preparation for Issue 331912.

Removing Inspector Instrumentation is happening separately, see Issue
448318.

BUG=331912

Review URL: https://codereview.chromium.org/855283004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188608 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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