Fixes for -Wunused-function on Linux, Android and ChromeOS

BUG=315884, 78045
TBR=owners

Review URL: https://codereview.chromium.org/67923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234373 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234373