Revert 106847 (according to rniwa, it breaks standalone webkit/chromium builds)

- roll clang 142072:142664

BUG=none
TEST=none
TBR=hans

Review URL: http://codereview.chromium.org/8370009

TBR=thakis@chromium.org
Review URL: http://codereview.chromium.org/8382027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107056 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -39,7 +39,7 @@ vars = {
   # tools/clang/scripts/update.sh. The script reads this line here.
   # Do NOT CHANGE this if you don't know what you're doing -- see
   # http://code.google.com/p/chromium/wiki/UpdatingClang
-  "clang_revision": "142664",
+  "clang_revision": "142072",
 }
 
 deps = {