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The style guide says that the _test suffix should be used for tests, and the
_unittest suffix is deprecated. Rename all the src/net/websockets test files to
match.

BUG=280943
TEST=net_unittests --gtest_filter="WebSocket*"

Review URL: https://chromiumcodereview.appspot.com/23614009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221708 0039d316-1c4b-4281-b951-d872f2087c98