Docserver: Fix missing samples in some API reference pages

BUG=309814
R=kalman
NOTRY=TRUE

Review URL: https://codereview.chromium.org/38923003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231169 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231169