Revert 120417 - roll clang 148911:149419

This pulled a bad revision of clang, that made mac_rel try bots sick.
BUG=112977
TEST=cross fingers.

Should fix -Wformat issues on 10.6.

test/Index/crash-recovery-modules.m fails locally at this revision, but we don't use the modules stuff yet anyway, so I disabled that test locally for this roll.

BUG=111861
TEST=none
TBR=hans

Review URL: http://codereview.chromium.org/9316097

TBR=thakis@chromium.org
Review URL: https://chromiumcodereview.appspot.com/9347015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120733 0039d316-1c4b-4281-b951-d872f2087c98

tools/clang/scripts/update.sh

@@ -8,7 +8,7 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION=149419
+CLANG_REVISION=148911
 
 THIS_DIR="$(dirname "${0}")"
 LLVM_DIR="${THIS_DIR}/../../../third_party/llvm"