More misc. cleanup:

* Put more code in anonymous namespaces
* Minor comment/variable name/spacing fixes
* Avoid unnecessary NULL-check
* 0 -> NULL

BUG=none
TEST=none
[email protected]

Review URL: https://codereview.chromium.org/19729010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212446 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed