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This CL addresses some feedback from Jamie regarding unit test naming conventions and organizations.
1. Renames test_eventSource.js to base_unittest.js.
2. Groups the modules by class instead of by function.
3. Adds extra test cases for base.js

Review URL: https://codereview.chromium.org/403663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284252 0039d316-1c4b-4281-b951-d872f2087c98