Remove some clang-related TODOs.
Remove some clang-related TODOs.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/7353028

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@92604 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build