Avoiding sending body with GET and DELETE requests
in order to restore pre https://code.google.com/p/selenium/source/detail?r=93dc12845343 behavior.

Note that HTTP/1.1 spec
1) allows body in DELETE,
2) mentions that it has no defined semantics and
3) that some existing server implementations may reject DELETE with body:
http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-19#section-6.7

WebDriver protocol does not seem to need the body in DELETE and it was not sent pre https://code.google.com/p/selenium/source/detail?r=93dc12845343
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Created by MOE: http://code.google.com/p/moe-java

Signed-off-by: AutomatedTester <dburns@mozilla.com>