[NaCl SDK] Remove unneeded warning supressions.

The no-unused-local-typedefs flag is no longer needed
since we moved to a new version of gtest.

The other warnings are all fixed in this CL.

R=binji@chromium.org, binji
BUG=270739

Review URL: https://codereview.chromium.org/77043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236370 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236370