Cast: Refactoring test to Clang format

This cl is mainly style-targeted refactoring. 
No functional changes were made. 
The test folder was re-organized as follows:
 - input_helper->input_builder (to match name of file and class).
- audio utility and video utility were moved to test/utility.
- crypto utility was removed as it had one function that was used in one file.

BUG=339176

Review URL: https://codereview.chromium.org/136153008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248288 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248288