[Patch resubmit]: Turn off autofill highlight when changing option in an autofilled <select> element

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This is a re-land of https://codereview.chromium.org/553983012/,
which was reverted as it broke
FormAutofillTest.ClearFormWithNodeContainingSelectOne browser_test.
The browser_test has now been updated in chromium.
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R=tkent@chromium.org
BUG=412311

Review URL: https://codereview.chromium.org/613213002

git-svn-id: svn://svn.chromium.org/blink/trunk@183127 bbb929c8-8fbe-4397-9dbb-9b2b20218538