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MaxTextOffset was computing the total text string for a given node in
UTF-16 just to obtain its length. Taking the length of std::string is
a constant-time operation, so eliminating this effort reduces the scale
factor from number of characters to number of nodes. On a simple test
page this led to a 24% speedup in MaxTextOffset which is used by a
variety of TextPattern methods.

Bug: 970297
Change-Id: Ie40e8032b72a45510a2a9ee6bc0e4c4cf5564627
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730094
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#683359}