WebString::data() should be private
WebString::data() should be private

WebString::data() is a memory footgun because it causes the underlying string
to be upconverted from 8 to 16 bits, meaning it takes 24 bits per character to
represent. This CL makes WebString::data() private as a prelude to deleting it.

TBR=eseidel

Review URL: https://codereview.chromium.org/15992004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151353 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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