I've unified the checks for language specific exceptions to line length. There is a behavior change where cpp compiler directives no longer have a maximum line length (previously they were restricted to 150% of max line length). This change was made to match the behavior for java files.

BUG=NONE

Review URL: https://codereview.chromium.org/100163002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@238268 0039d316-1c4b-4281-b951-d872f2087c98