Gardening: Ask rebaseline for some tests.
Gardening: Ask rebaseline for some tests.

* text-combine-image-test.html
  Wrong expectation was committed due to the pixel test flakiness.

* emphasis-complex.html
  Harfbuzz update.

BUG=458077,452326
TBR=eae@chromium.org

Review URL: https://codereview.chromium.org/924433003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190117 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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