Fix Chromium build breakage introduced by r6280
Fix Chromium build breakage introduced by r6280

r6280 removed nacl_elf.h but did not update a file that #included it
that is only used in the Chromium build.  We remove this unneeded #include,
plus a couple of others.

BUG=http://code.google.com/p/chromium/issues/detail?id=91482
TEST=compile this file on its own

Review URL: http://codereview.chromium.org/7564012

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6302 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client