Miscellanous changes detected by strict aliasing warnings.

BUG=32204, 92681
R=dmichael@chromium.org, sergeyu@chromium.org

Review URL: https://codereview.chromium.org/26406002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227548 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227548