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The raw pointer overload of ListValue::Append() is deprecated and will
be removed. Instead, code should just write:
- ListValue::AppendBoolean()
- ListValue::AppendInteger()
- ListValue::AppendDouble()
- ListValue::AppendString()

BUG=581865

Review-Url: https://codereview.chromium.org/2037833003
Cr-Commit-Position: refs/heads/master@{#398228}