Bug 910109 (part 1) - Make jsproxy.h not depend on jsapi.h.  r=luke.

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extra : rebase_source : bc2fa911e3a7feaafb778b756994e126257585a7
Bug 910109 (part 2) - Make jswrapper.h not depend on jsapi.h.  r=luke.

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extra : rebase_source : 138e93b074691e9da0feab9cd24e149f4d5edf6a
Bug 909514 (follow-up) - Remove unnecessary |#include "jsapi.h"| from BindingDeclarations.h.  r=bz.

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extra : rebase_source : 10c9aa3cb7cdc0892c5c07d93adfc23a0bec904d