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(by initializing its length_ to 0), and to return the number of bytes skipped
if buffer==null, rather than returning the offset.
Review URL: http://codereview.chromium.org/8800017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113197 0039d316-1c4b-4281-b951-d872f2087c98