Update base::StartsWith calls to new form.
Update base::StartsWith calls to new form.

The new form takes an case-sensitivity enum rather than a bool. This maps
 true -> base::CompareCase::SENSITIVE
 false with punctuation only -> base::CompareCase::SENSITIVE
 false with ascii constants -> base::CompareCase::INSENSITIVE_ASCII
 false with arbitrary string16 -> base::CompareCase::SENSITIVE with base::i18n::ToLower() on the arguments.

This also updates a few SplitString calls to the new form that I encountered along the way.

BUG=506920, 506255

Review URL: https://codereview.chromium.org/1220963005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337442}

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