Add RELEASE_ASSERT to InlineTextBox::constructTextRun

This patch adds RELEASE_CHECK of offset and length to
InlineTextBox::constructTextRun(). StringView constructor only does
SECURITY_DCHECK intentionally, see http://crrev.com/2587863002.

BUG=671328

Review-Url: https://codereview.chromium.org/2588193003
Cr-Commit-Position: refs/heads/master@{#439721}
1 file changed