IDL lint fixes

Minor formatting fixes to IDL files;
beyond style, useful for simplifying grepping.

TBR=haraken

Review URL: https://codereview.chromium.org/74793003

git-svn-id: svn://svn.chromium.org/blink/trunk@162177 bbb929c8-8fbe-4397-9dbb-9b2b20218538