roll clang 146361:147225

BUG=107412
TEST=none
TBR=hans

Review URL: http://codereview.chromium.org/9007051

git-svn-id: http://src.chromium.org/svn/trunk/src/build@115755 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -1962,6 +1962,9 @@
               # This (rightyfully) complains about 'override', which we use
               # heavily.
               '-Wno-c++11-extensions',
+              # TODO(thakis): Reenable this once clang stops complaining about
+              # %as in format strings.
+              '-Wno-format',
             ],
             'cflags!': [
               # Clang doesn't seem to know know this flag.