Remove JavaScriptCore, which is unused

We actually do use a small piece of JavaScriptCore called yarr, which is
retained in this CL.

This CL was created by running clean-06-javascriptcore.py from pyclean.

TBR=eseidel

git-svn-id: svn://svn.chromium.org/blink/trunk@147579 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2073 files changed