2013-09-19  Sharath Kamath  <s.kamath@samsung.com>

        ComputeContext constructor simplification.
        Issue #219

        Reviewed by NOBODY (OOPS!).

        Remove ComputeContext constructor supporting only deviceType as it is not used in WebCL.
        Can be added back as need arises.

        No new tests (OOPS!).

        * platform/ComputeContext.h:
        * platform/opencl/ComputeContextCL.cpp:
        (WebCore::ComputeContext::ComputeContext):