Adam Barth e3f9e2de4b Remove more mouse-specific code
This CL removes a bunch of unused mouse-related code, including the
MouseRelatedEvent base class.

R=eseidel@google.com, eseidel@chromium.org

Review URL: https://codereview.chromium.org/873963003
2015-01-24 11:18:35 -08:00
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